Contributed Talks and Poster Presentations

*The presenter name is underlined. 

1. Caesnan M. G. Leditto, Angus Southwell, Behnam Tonekaboni, Gregory A. L. White, Muhammad Usman and Kavan Modi, "Topological signal processing on quantum computers for higher-order network analysis", QIP 2024 Taipei Taiwan, Jan 13-19, 2024 (Poster Presentation)

2. S. Gicev, Lloyd Hollenberg, M. Usman, "Neural network processing of syndrome measurement data for quantum error correction", 7th International Conference on Quantum Error Correction (QEC23), October 30-November4, 2023, Sydney Australia. (Poster Presentation)

3. M. West, C. Nikhl, J. Heredge, F. Creevey, L.C.L. Hollenberg, M. Sevior, M. Usman, "Approximate state preparation for efficient and robust quantum machine learning", 7th International Conference on Quantum Techniques in Machine Learning (QTML 2023), November, 2023, CERN, Geneva, Switzerland.

4. M. West, C. Nikhl, J. Heredge, F. Creevey, C. Leckie, S. Erfani, L.C.L. Hollenberg, M. Sevior, M. Usman, "Quantum machine learning with enhanced adversarial robustness", 7th International Conference on Quantum Techniques in Machine Learning (QTML 2023), November, 2023, CERN, Geneva, Switzerland.

5. A. Khatun and M. Usman, "Enhancing quantum convolutional neural networks through classical pre-training and adversarial robustness evaluation", IEEE Quantum Week 2023, Washington USA.

6. H. Nguyen, M. Usman, R. Buyya, "iQuantum: a case for modeling simulating hybrid quantum computing enviornment", IEEE Quantum Software Workshop, July 2023, Chicago USA.

7. M. West, M. Sevior, M. Usman, "B Meson flavour tagging via continuous variable quantum support vector machines", 26th International Conference on Computing in High Energy & Nuclear Physics (CHEP 2023), May8-12, 2023, Norfolk, VA 23510 USA. (Oral Presentation)

8. M. West, Shu-Lok Tsang, ..., Lloyd Hollenberg, Sarah Erfani, M. Usman, "Quantum enhanced robustness in adversarial machine learning", Australian Institute of Physics Congress, December 11-16, 2022, Adelaide Australia. (Oral Presentation)

9. S. Gicev, Lloyd Hollenberg, M. Usman, "Artificial neural network decoding for surface code", Australian Institute of Physics Congress, December 11-16, 2022, Adelaide Australia. (Oral Presentation)

10. M. West, M. Sevior, M. Usman, "B Meson flavour tagging by quantum machine learning", Australian Institute of Physics Congress, December 8, 2022, Adelaide Australia. (Oral Presentation)

11. M. West, M. Usman, "Influence of momentum space features on scanning tunnelling microscope images of subsurface donors in silicon", Quantum Australia, September 8, 2021, Sydney Australia. (Poster Presentation)

12. S. Gicev, L. Hollenberg, M. Usman, "Artificial neural network decoding for the surface code", Quantum Australia, September 8, 2021, Sydney Australia. (Poster Presentation)

13. B. Harper, M. Usman, C. Hill, "Classical simulation of quantum circuits with a mixed state stabiliser simulator", Quantum Australia, September 8, 2021, Sydney Australia. (Poster Presentation)

14. O. Glenister, L. Hall, M. Usman, C. Hill, "Simultaneous CNOT gates for donor qubits in silicon", Quantum Australia, September 8, 2021, Sydney Australia. (Poster Presentation)

15. M. Usman, C.D. Hill, L.C.L. Hollenberg, "Characterisation of atomic qubits in silicon by machine learning", Machine Learning for Quantum (MLQ2021), March 1-5, 2021Virtual Meeting. (Oral Talk)

16. Marina Castelli, Jack Hellerstedt, Cornelius Krull, Spiro Gicev, Lloyd Hollenberg, Muhammad Usman, Agustin Schiffrin, "Long-range Surface-Assisted Molecule-Molecule Hybridization", APS March Meeting 2021 (Oral Talk)

17. S. Gicev, M. Usman, L.C.L. Hollenberg, "Artificial neural network decoding scheme in surface code architectures", Annual Workshop ARC Center for Quantum Computation and Communication Technology, February 11-15, 2021. (Poster Presentation) 

18. S. Gicev, M. Usman, L.C.L. Hollenberg, "Artificial neural network decoding scheme in surface code architectures", 24th Annual Conference on Quantum Information Processing (QIP21), February 1-5, 2021. (Poster Presentation) 

19. M. Usman, Y.Z. Wong, C.D. Hill, L.C.L. Hollenberg, "Autonomous characterisation of atomic-qubits in silicon by machine learning", Silicon Quantum Electronics Workshop, October 14-16, 2019, San Sebastian, Spain. (Oral Presentation)

20. M. Usman, Y.Z. Wong, C.D. Hill, L.C.L. Hollenberg, "Characterisation of atomic-qubits in silicon by machine learning", Australian Institute of Physics (AIP) Summer Meeting, December 2-6, 2019, RMIT University, Melbourne Australia. (Oral Presentation)

21. M. Usman, C.D. Hill, L. Hollenberg, "Design and characterisation of two-qubit gates for donor qubits in silicon", ARO Annual Program Review, 29 July - August 4, 2019, Annapolis MD USA. (Poster Presentation)

22. M. Usman, C.D. Hill, L.C.L. Hollenberg, "A surface code quantum computer architecture for donor qubits in silicon", CQC2T Annual Workshop, Feb 12-15, 2019, Sydney Australia. (Oral Presentation) (Awarded second best talk prize)

23. C.D. Hill, M. Usman, L. Hollenberg, "Architecture for a 2D surface code quantum computer based on exchange-coupled donor qubits in silicon", Silicon Quantum Electronics Workshop, 13-15 November, 2018, Sydney Australia. (Oral Presentation)

24. V. S. Perunicic, C.D. Hill, M. Usman, L. Hollenberg, "Donor qubits in silicon as a platform for magnetic resonance imaging of single molecules", Silicon Quantum Electronics Workshop, 13-15 November, 2018, Sydney Australia. (Poster Presentation)

25. M. Usman, C.D. Hill, B. Voisin, J. Salfi, S. Rogge, L. Hollenberg, "Towards high-fidelity CNOT gates from phosphorus donor qubits in silicon", Silicon Quantum Electronics Workshop, 13-15 November, 2018, Sydney Australia. (Oral Presentation)

26. M. Usman, C.D. Hill, B. Voisin, J. Salfi, M.Y. Simmons, S. Rogge, L.C.L. Hollenberg, "Towards robust two-qubit CNOT gates based on phosphorus donor qubits in silicon", 23rd Australian Institute of Physics Congress, December 9-13, 2018 Perth Australia. (Oral Presentation)

27. B. Voisin, J. Salfi, A. Tankasala, M. Usman, B.C. Johnson, J.C. McCallum, R. Rahman, M.Y. Simmons, L.C.L. Hollenberg, S. Rogge, "Imaging valley interference to tackle exchange variations for donors in silicon", 23rd Australian Institute of Physics Congress, December 9-13, 2018 Perth Australia. (Oral Presentation)

28. B. Voisin, J. Salfi, M. Usman, J. Bocquel, A. Tankasala, B.C. Johnson, J.C. McCallum, R. Rahman, M.Y. Simmons, L.C.L. Hollenberg, S. Rogge, "Quantum state imaging of atomically precise devices in silicon", 34th International Conference on Physics of Semiconductors (ICPS), July 29-August 3, 2018, Montpellier France. (Oral Presentation) 

29. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Atomic-precision spatial metrology of phosphorous donors in silicon by STM imaging of wave functions", Third Conference and Workshop on Spin-based Quantum Information Processing (SpinQubit3), November 6-10 2017, Sydney Australia (Poster Presentation)

30. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Atomic-precision spatial metrology of single and two SiP qubits", Australian Institute of Physics (AIP) Summer Meeting, December 4-8 2017, Sydney Australia (Oral Presentation)

31. Muhammad Usman, Charles D. Hill, Lloyd C. L. Hollenberg, "High-fidelity CNOT gate from atomic-precision fabrication of phosphorous donor qubits in silicon", International Workshop on Silicon Quantum Electronics, August 18-20 2017, Intel Jones Farm Conference Center, Hillsboro, Oregon USA (Poster Presentation)

32. Charles D. Hill, Muhammad Usman, Sven Rogge, Michelle Y. Simmons, Lloyd C. L. Hollenberg, "Adiabatic quantum computing in silicon", International Workshop on Silicon Quantum Electronics, August 18-20 2017, Intel Jones Farm Conference Center, Hillsboro, Oregon USA (Poster Presentation)

33. B. Voisin, J. Salfi, J. Bocquel, M. Usman, A. Tankasala, B.C. Johnson, J.C. McCallum, R. Rahman, M.Y. Simmons, L.C.L. Hollenberg, S. Rogge, "Quantum tunneling microscope of an atomic scale device in silicon", International Workshop on Silicon Quantum Electronics, August 18-20 2017, Intel Jones Farm Conference Center, Hillsboro, Oregon USA (Oral Presentation)

34. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Atomic-precision spatial metrology of phosphorous donors in silicon by STM imaging of wave functions", International Workshop on Silicon Quantum Electronics, August 18-20 2017, Intel Jones Farm Conference Center, Hillsboro, Oregon USA (Oral Presentation)

35. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Atomic-precision metrology of phosphorous dopants in silicon by STM imaging of wave functions", International Workshop on Silicon Quantum Electronics, August 18-20 2017, Intel Jones Farm Conference Center, Hillsboro, Oregon USA  (Oral Presentation)

36. B. Voisin, J. Salfi, J. Bocquel, M. Usman, A. Tankasala, B.C. Johnson, J.C. McCallum, G. Klimeck, R. Rahman, M.Y. Simmons, L.C.L. Hollenberg, S. Rogge, "Quantum tunneling microscope of an atomic scale device in silicon", Spintech 2017 Japan. (Oral Presentation)

37. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Atomically precise metrology of dopants in silicon", CQC2T Workshop Kingscliff, February 5-7 2017, New South Wales, Australia (Oral Presentation) (Selected as the second best talk from over 30 talks )

38. Muhammad Usman, Charles D. Hill, Lloyd Hollenberg, "Large Scale Atomistic Simulations of Donor Devices", CQC2T Workshop Kingscliff, February 5-7 2017, New South Wales, Australia (Poster Presentation)

39. Muhammad Usman, Charles D. Hill, Lloyd Hollenberg, "Design and control of phosphorous donor qubits in strained silicon environment", APS March Meeting 2017 New Orleans USA (Oral Presentation)

40. Archana Tankasala, Juanita Bocquel, Joe Salfi, Benoit Voisin, Muhammad Usman, Lloyd Hollenberg, Sven Rogge, Rajib Rahman, "Exchange coupled donor molecules in silicon", APS March Meeting 2017 New Orleans USA (Oral Presentation)

41. Joe Salfi, Benoit Voisin, Archana Tankasala, Juanita Bocquel, Muhammad Usman, Michelle Simmons, Lloyd Hollenberg, Rajib Rahman, Sven Rogge, "Atomically precise control of a coupled donor-quantum dot system in silicon", APS March Meeting 2017 New Orleans USA (Oral Presentation)

42. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Atomically precise metrology of dopants in silicon", 8th International Conference on Advanced Materials and Nanotechnology (AMN8), 12-16 February 2017, Queenstown New Zealand. (Oral Presentation)

43. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Atomically precise metrology of dopants in silicon", APPC-AIP December 2016, Brisbane Australia. (Oral Presentation) 

44. Charles Hill, Muhammad Usman, Eldad Peretz, Samuel Hile, Matthew House, Martin Fuechsle, Jois Keizer, Sven Rogge, Michelle Simmons, Lloyd Hollenberg, "A surface code quantum computer in silicon and NEMO T2 calculations", ARO Quantum Computing Review Meeting 2016, USA. (Poster Presentation) 

45. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Pinpointing Silicon-dopant Qubits with Single Lattice Site Precision", 33rd International Conference on Physics of Semiconductors (ICPS) August 2016, Beijing China. (Poster Presentation) 

46. Juanita Bocquel, Benoit Voisin, Joe Salfi, Archana Tankasala, Muhammad Usman, Rajib Rahman, Gerhard Klimeck, Brett C. Johnson, Jeffery C. McCallum, Michelle Y. Simmons, Lloyd Hollenberg, Sven Rogge, "Controlling and imaging interacting donor wave functions in silicon", 33rd International Conference on Physics of Semiconductors (ICPS) August 2016, Beijing China. (Poster Presentation) 

47. Viktor Perunicic, Muhammad Usman, Charles D. Hill, Lloyd C. L. Hollenberg, "Silicon spin qubit as a probe for biological imaging", Silicon Quantum Electronics Workshop, 13-14 June 2016, Tu Delft Amsterdam, Netherlands. (Poster Presentation) 

48. Muhammad Usman, Juanita Bocquel, Joe Salfi, Benoit Voisin, Archana Tankasala, Rajib Rahman, Michelle Y. Simmons, Sven Rogge, Lloyd C. L. Hollenberg, "Atomically precise metrology of dopant positions in silicon", Silicon Quantum Electronics Workshop, 13-14 June 2016, Tu Delft Amsterdam, Netherlands. (Poster Presentation) 

49. Joe Salfi,  Benoit Voisin, Juanita Bocquel, Jan A. Mol, Archana Tankasala, Muhammad Usman, Rajib Rahman, Gerhard Klimeck, Brett Johnson, Jeffrey McCallum, Michelle Y. Simmons, Lloyd C. L. Hollenberg, Sven Rogge, "Quantum Simulation of the Hubbard Model with Dopant Atoms in Silicon", Silicon Quantum Electronics Workshop, 13-14 June 2016, Tu Delft Amsterdam, Netherlands. (Oral Presentation) 

50. Benoit Voisin, Juanita Bocquel, Joe Salfi, Archana Tankasala, Muhammad Usman, Rajib Rahman, Gerhard Klimeck, Brett Johnson, Jeffrey McCallum, Michelle Y. Simmons, Lloyd C. L. Hollenberg, Sven Rogge, "Electrical addressing of donor system in the STM", Silicon Quantum Electronics Workshop, 13-14 June 2016, Tu Delft Amsterdam, Netherlands. (Poster Presentation) 

51. Lloyd L.C. Hollenberg, (including work from Charles D. Hill and Muhammad Usman), "Large scale quantum computing in silicon", International Conference on Nanoscale and Nanotechnology ICONN'16 (Feb 7-11 2016), National Convention Centre, Canberra, Australia. (Oral Presentation) 

52. Muhammad Usman, Charles D. Hill, Rajib Rahman, Gerhard Klimeck, Sven Rogge, Michelle Y. Simmons, Lloyd C. L. Hollenberg, "Strain and electric field control of the hyperfine couplings of shallow donors in silicon", ARO review meeting 10-12 August 2015, San Diego, CA, USA. (Poster Presentation) 

53. Archana Tankasala, Yu Wang, Joe Salfi, Juanita​ Bocquel, Benoit Voisin, Muhammad Usman, Sven Rogge, Michelle Simmons, Lloyd C. L. Hollenberg, Rajib Rahman, Gerhard Klimeck, "Modeling exchange interaction in bulk and sub-surface donor pairs in silicon for two-qubit gates​", ARO Quantum computing program review, San Diego USA, Aug 10-12, 2015. (Poster Presentation) 

54. Muhammad Usman, Charles D. Hill, Rajib Rahman, Gerhard Klimeck, Sven Rogge, Michelle Y. Simmons, Lloyd L.C. Hollenberg, "The influence of strain and electric fields on the hyperfine couplings of shallow donors in silicon", Silicon Quantum Electronics Workshop, 3-4 August 2015, Takamatsu, Japan. Abstract Here; Conference program here (Oral Presentation) 

55. Juanita Bocquel, Benoit Voisin, Joe Salfi, Muhammad Usman, Aarchana Tankasala, Rajib Rahman, Gerhard Klimeck, Michelle Y. Simmons, Lloyd C. L. Hollenberg, and Sven Rogge, "Spatially resolving coupled donor states in silicon", Silicon Quantum Electronics Workshop, 3-4 August 2015, Takamatsu, Japan. Conference program here (Poster Presentation) 

56. Benoit Voisin, Juanita Bocquel, Joe Salfi, Muhammad Usman, Archana Tankasala, Rajib Rahman, Gerhard Klimeck, Michelle Y. Simmons, Lloyd C. L. Hollenberg, Sven Rogge, "Spatially resolving coupled donors quantum states in silicon", SpinTech VIII, Basel, Switzerland, August 10-13, 2015. Conference program here (Poster Presentation) 

57. H. Carrere, C.A. Broderick, S. Mazzucato, S. Azaizia, F.B. de le Salle, D. Lagarde, P. Boonpeng, A. Arnoult, A. Balocchi, T. Amand, C. Fontaine, O. Donmez, A. Erol, M. Usman, E.P. O'Reilly, X. Marie "Experimental and theoretical determination of electron g factor in GaAsBi alloys", 6th International Workshop on Bismuth-Containing Semiconductors, 19-22 July 2015, University of Wisconsin-Madison, USA. Abstract Here (Oral Presentation) 

58. Muhammad Usman, Joe Salfi, Juanita Bocquel, Benoit Voisin, Rajib Rahman, Sven Rogge, Lloyd L.C. Hollenberg, "Tight-binding calculations of subsurface donor images as measured by scanning tunneling microscopy", CQC2T Workshop at Kingscliff, New South Wales (NSW), Australia, February 18 - 20, 2015. (Oral Presentation) 

59. Juanita Bocquel, Benoit Voisin, Joe Salfi, Archana Tankasala, Muhammad Usman, Rajib Rahman, Bret Johnson, Jeffry McCallum, Lloyd C. L. Hollenberg, Michelle Simmons, Sven Rogge, "Correlated quantum states probed in real space in silicon", CQC2T Workshop at Kingscliff, New South Wales (NSW), Australia, February 18 - 20, 2015. (Poster Presentation) 

60. Muhammad Usman, Rajib Rahman, Joe Salfi, Juanita Bocquel, Benoit Voisin, Sven Rogge, Gerhard Klimeck, Lloyd L.C. Hollenberg, "The role of central-cell correction in tight-binding theory for shallow donors in Silicon", Silicon Quantum Electronics Workshop, 18-19 August 2014, Sandia National Labs, Albuquerque, New Mexico, USA. Abstract Here (Poster Presentation) 

61. Muhammad Usman, Christopher A. Broderick, Eoin P. O'Reilly, "Alloy disorder effects in GaBiAs/GaAs single quantum wells", 5th International Workshop on Bismuth-Containing Semiconductors, 21-23 July 2014, Tyndall National Institute, Lee Maltings, Cork Ireland. Abstract Here (Oral Presentation) 

62. Muhammad Usman, Lloyd L.C. Hollenberg, "Tight-binding theory of the hyperfine interaction of shallow donors in Silicon", ARO Review meeting 11-15 August 2014, Washington DC, USA. (Poster Presentation) 

63. B. Voisin, J. Bocquel, J. Salfi, M. Usman, R. Rahman, L. C.L. Hollenberg, M.Y. Simmons and S. Rogge "Valleys in Few Electron Quantum States Probed in Real Space", ARO Quantum Computing Program Review meeting 11-15 August 2014, Washington DC, USA. (Poster Presentation) 

64. Christopher A. Broderick, Muhammad Usman, Eoin P. O'Reilly, "Theory of the enhancement of the electron effective g-factor in GaBiAs/GaAs epilayers", 5th International Workshop on Bismuth-Containing Semiconductors, 21-23 July 2014, Tyndall National Institute, Lee Maltings, Cork Ireland. Conference program here (Oral Presentation) 

65. Muhammad Usman, Rajib Rahman, Lloyd L.C. Hollenberg, "Donor hyperfine Stark shift and the tight-binding central cell correction", CQC2T Workshop at Twin Waters Resort, Sunshine Coast, Queensland, Australia, April 28 - May 1, 2014. (Oral Presentation) 

66. Eoin P. O'Reilly, Stefan Schulz, Mark T. Crowley, Muhammad Usman, and Ramzi Benchamekh,, "Shape Dependence of Quantum Dot Heavy-Hole Eigenstates", Colloquia on Semiconductors-I: Coherence properties in semiconductor quantum dots, Condensed-Matter in Paris, CMD-25 and JMC-14, August 24-29, 2014. Abstract Here (Oral Presentation) 

67. Christopher A. Broderick, Muhammad Usman, Eoin P. O'Reilly, "Theory of the electronic structure of the dilute bismide alloy GaBiAs", 32nd International Conference on the Physics of Semiconductors (ICPS-2014), August 10-15, 2014, University of Texas Austin, TX, USA. Abstract Here (Poster Presentation) 

68. Christopher A. Broderick, Muhammad Usman, Eoin P. O'Reilly, "Multi-scale modelling of the electronic structure of dilute bismide alloys", TMCS-2014 (Theory, Modelling and Computational Methods for Semiconductors), 22-24 Jan., 2014, University of Salford, Manchester, UK. Abstract Here (Oral Presentation) 

69. Christopher A. Broderick, Muhammad Usman, Eoin P. O'Reilly, "Theory of the enhancement of the electron effective g-factor in GaBiAs/GaAs epilayers", TMCS-2014 (Theory, Modelling and Computational Methods for Semiconductors), 22-24 Jan., 2014, University of Salford, Manchester, UK. (Oral Presentation) 

70. Muhammad Usman, Christopher A. Broderick, Eoin P. O'Reilly, "Electronic Structure and Gain Engineering in Type-I GaBiAs and GaBiNAs Quantum Well Devices", UK Semiconductors 2013 Meeting, July 3-4, 2013, Sheffield-Hallam University UK. Abstract Here (Oral Presentation) 

71. S. R. Jin, K. Hild, I. P. Marko, Z. Batool, S. J. Sweeney, C. A. Broderick, M. Usman, E. P. O'Reilly, P. Ludewig, W. Stolz, K. Volz, "Band properties of GaAsN/GaAsBi type II structures on GaAs", UK Semiconductors 2013 Meeting, July 3-4, 2013, Sheffield-Hallam University UK. Abstract Here (Oral Presentation) 

72. Christopher A. Broderick, Muhammad Usman, Eoin P. O'Reilly, "Theory of Dilute Bismide Alloys For High Efficiency, Uncooled Telecomm Lasers",  Photonics Ireland 2013 (http://www.photonicsireland2013.co.uk/), Sept. 4-6, 2013, Belfast UK. Abstract Here (Oral Presentation) 

73. S. R. Jin, K. Hild, I. P. Marko, Z. Batool, S. J. Sweeney, C. A. Broderick, M. Usman, E. P. O'Reilly, P. Ludewig, W. Stolz, K. Volz, "GaAsN/GaAsBi type-II structures for mid-infrared photonic devices", 4th International Conference on Bismuth-Containing Semiconductors: Growth, Properties and Devices, July 14-17, 2013, University of Arkansas, Arkansas, USA. (Oral Presentation) 

74. Christopher A. Broderick, Muhammad Usman, Eoin P. O'Reilly, "Theoretical investigation of the gain characteristics of dilute bismide and bismide-nitride quantum well lasers", Semiconductor and Integrated OptoElectronics (SIOE) Conference, April 9-11, 2013, Cardiff University UK. Abstract Here (Oral Presentation) 

75. Eoin P. O'Reilly, Muhammad Usman, and Christopher A. Broderick, "Theory of the electronic structure of dilute bismide and bismide-nitride alloys of GaAs", 24th General Conference of the EPS Condensed Matter Division, 3-7 September 2012, Edinburgh, UK. (Oral Presentation) 

76. Christopher A. Broderick, Muhammad Usman, and Eoin P. O'Reilly, "Band structure engineering in dilute bismide semiconductor lasers", poster presented at the Celebration of the 50th Anniversary of the Diode Laser Meeting organized by Institute of Physics (IOP), 20th-21th September, 2012, University of Warwick, Conventry UK. Abstract Here (Oral Presentation) 

77. Christopher A. Broderick, Muhammad Usman, and Eoin P. O'Reilly, "Tight Binding and k.p models for electronic structure calculations of GaBiNAs and InGaBiAs", 3rd International Workshop on Bismuth-containing Semiconductors - Theory & Experiment, July 2012, Victoria, Canada. (http://www.bismides.net) (Oral Presentation) 

78. Muhammad Usman, Christopher A. Broderick, Eoin P. O'Reilly, "Theory of the electronic structure of dilute bismide and bismide-nitride alloys of GaAs: Tight-binding and k.p models", 31st International Conference on the Physics of Semiconductors (ICPS), July 29 - August 2012, ETH Zurich, Switzerland. Abstract Here (Poster Presentation) 

79. Vittorianna Tasco, Muhammad Usman, Maria T. Todaro, M. De Giorgi, and Adriana Passaseo, "Understanding polarisation properties of InAs QDs by atomistic modeling of growth dynamics", 31st International Conference on the Physics of Semiconductors (ICPS), July 29 - August 3, 2012, ETH Zurich, Switzerland. Abstract Here (Poster Presentation) 

80. Muhammad Usman, Yui-Hong Matthias Tan, and Gerhard Klimeck, "Theoretical correlation between quantum dot composition and electronic properties", 7th International Conference on Quantum Dots (QD-2012), May 13-18, 2012, Santa Fe Convention Center, Santa Fe, New Mexico, USA. (http://qd2012.newmexicoconsortium.org/) Abstract Here (Poster Presentation) 

81. Eoin P. O'Reilly, Muhammad Usman, Christopher A. Broderick, Stephen J. Sweeney, Zahida Batool, Konstanze Hild, S. R. Jin, and T. J. C. Hosea, "Band engineering of dilute bismide alloys for efficient near- and mid-infrared semiconductor lasers", SPIE Photonics Europe Meeting, 16-20 April, 2012, Brussels, Belgium, (http://spie.org/x12290.xml) (Oral Presentation) 

82. Muhammad Usman, Christopher A. Broderick, and Eoin P. O'Reilly, "Theory of the Electronic Structure of Novel Dilute Bismide Alloys (GaBiP & GaBiAs) for Optical Devices", 3rd Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nanostructures (Semicon Nano), September 11-16, 2011, Traunkirchen, Austria; (http://www.hlphys.jku.at/SemiconNano2011/); Abstract Here (Oral Presentation) 

83. Christopher A. Broderick, Muhammad Usman, Andrew Lindsay, and Eoin P. O'Reilly, "Electronic Structure of Dilute Bismide Alloys: Tight binding and k.p theory", Photonics Ireland, Malahide Dublin, Sept. 7-9, 2011 (Poster Presentation) (http://www.photonicsirelandconference.ie/). 

84. Muhammad Usman, "Polarization Dependent Optical Emissions from Stacked InAs Quantum Dots", 3rd Workshop on Epitaxial Growth and Fundamental Properties of Semiconductor Nano-structures (Semicon Nano), September 11-16, 2011, Traunkirchen, Austria. (http://www.hlphys.jku.at/SemiconNano2011/); Abstract Here (Oral Presentation) 

85. Christopher A. Broderick, Muhammad Usman, Andrew Lindsay, and Eoin P. O'Reilly, "Band anti-crossing dilute bismide alloys: Tight binding and k.p analysis", 2nd International Workshop on Bismide containing Semiconductors: Theory, Simulation, and Experiment, Surrey University UK, July 18-20, 2011 (http://www.bismides.net/). (Oral Presentation) 

86. Muhammad Usman, Christopher A. Broderick, Andrew Lindsay, and Eoin P. O'Reilly, "Electronic Structure Calculations for GaBiAs and GaBiP Alloys - Atomistic Tight Binding Approach", 2nd International Workshop on Bismide-containing Semiconductors: Theory, Simulation, and Experiment, July 18-20, 2011, Surrey University UK. (http://www.bismides.net/) (Oral Presentation) 

87. Muhammad Usman, Susannah Heck, Edmund Clarke, Peter Spencer, Ray Murray, Gerhard Klimeck, Eoin P. O'Reilly, "Polarization-resolved Optical Transitions from InAs QDs at Telecommunication Wave-lengths", Quantum Dot Day Workshop January 10, 2011, University of Bristol, UK. (http://www.phy.bris.ac.uk/groups/cqp/DotWorkshop11/index.html) (Poster Presentation) 

88. Muhammad Usman, "Polarisation dependent optical transitions from In(Ga)As quantum dots", American Physical Society, March Meeting 2011, Dallas Texas USA. (Oral Presentation) 

89. Sasi Sundaresan, Muhammad Usman, and Shaikh S. Ahmed, "Effects of Internal Fields in Self-Assembled InN/GaN Quantum Dots: Multimillion-Atom Tight-Binding Simulations", Sci. DAC 2010, July 11-15, Chattanooga, Tennessee, USA. (Poster Presentation) 

90. Muhammad Usman, and Gerhard Klimeck, "Wavelength-engineered InAs quantum dots", American Physical Society (APS), March Meeting, Portland Oregon, 2010. Abstract Here (Oral Presentation) 

91. Muhammad Usman, Hoon Ryu, and Gerhard Klimeck, "Quantum Confined Stark Effect in Biased InAs/GaAs Quantum Dots", 13th International Workshop on Computational Electronics (IWCE), Tsinghua University, Beijing, May 27-29 2009. Abstract Here (Oral Presentation) 

92. Muhammad Usman and Gerhard Klimeck, "Quantum confined stark effect in non-identical InAs/GaAs coupled quantum dots: Dependence on vertical electrical field", American Physical Society (APS), March Meeting, Pittsburgh, March 16-20, 2009. Abstract Here (Oral Presentation) 

93. Gerhard Klimeck, Mathieu Luisier, Muhammad Usman, Neerav Kharche, Hoon Ryu, Sunhee Lee, Dragica Vasileska, "Nano-Scale Carrier Transport on an atomistic basis using NEMO 3-D and OMEN", Aspen Winter Conference on Unifying Themes in Condensed Matter, Jan. 12-16, 2009. (Oral Presentation) 

94. Muhammad Usman, Hoon Ryu, Shaikh Ahmed, and Gerhard Klimeck, "Atomistic tight binding study of interband light transitions in self-assembled InAs/GaAs quantum dots", Material Research Society, Fall 2008 Meeting Boston, December 1-4, 2008. (Oral Presentation) 

95. Gerhard Klimeck, Mathieu Luisier, Muhammad Usman, Neerav Kharche, Hoon Ryu, Sunhee Lee, Dragica Vasileska, "Nanoelectronic Modeling using NEMO 3-D and OMEN and their Deployment on nanoHUB.org", 13th Advanced Heterostructures and Nanostructures Workshop, Hapuna Beach, Hawaii, Dec. 7-12, 2008. (Oral Presentation) 

96. Muhammad Usman, Dragica Vasileska, and Gerhard Klimeck, "Strain-engineered self-organized InAs/GaAs quantum dots for long wavelength applications", Proceedings of ICPS 2008 (International Conference on the Physics of Semiconductors), Rio de Janeiro, Brazil, July 27-Aug 1, 2008. (Poster Presentation) 

97. Muhammad Usman, Shaikh Ahmed, and Gerhard Klimeck, "A tight binding study of strain-reduced confinement potentials in identical and non-identical InAs/GaAs vertically stacked quantum dots", IEEE nano 2008, Arlington, TX, August 18-21, 2008 (Oral presentation) (8th IEEE Conference on Nanotechnology, 2008, NANO-2008, August 18-21 2008 Page(s):541-544. (Oral Presentation) 

98. Muhammad Usman, Shaikh Ahmed and Gerhard Klimeck, "Strain and Piezoelectric effect on electronic structure of vertically stacked InAs/GaAs Quantum dots", American Physical Society (APS), March Meeting, March 2008 New Orleans. (Poster Presentation) 

99. Shaikh Ahmed, Muhammad Usman, Neerav Kharche, Andrei Schliwa, and Gerhard Klimeck, "Atomistic Simulation of Non-Degeneracy and Optical Polarization Anisotropy in Pyramidal Quantum Dots", IEEE International Conference on Nano/Micro Engineered and Molecular Systems (IEEE NEMS), Jan 16-19, 2007, Bangkok Thailand (340 submissions, 55% oral presentations). (Poster Presentation) 

100. Shaikh Ahmed, Muhammad Usman, Clemens Heitzinger. Rajib Rahman, Andrei Schliwa, and Gerhard Klimeck, "Symmetry Breaking and Fine Structure Splitting in Self-Assembled Zincblende Quantum Dots: Atomistic Simulations of Long-Range Strain and Piezoelectric Field", 28th International Conference on the Physics of Semiconductors, ICPS 2006, Vienna, Austria, July 24-28 2006, AIP Conference Proceedings Volume 893, pg 849. (Poster Presentation) 

101. Muhammad Usman, Shaikh Ahmed, Marek Korkusinski, Clemens Heitzinger, and Gerhard Klimeck, "Strain and electronic structure interactions in realistically scaled quantum dot stacks", 28th International Conference on the Physics of Semiconductors, ICPS 2006, Vienna, Austria, July 24-28 2006, AIP Conference Proceedings Volume 893, pg. 847. (Poster Presentation) 

102. Gerhard Klimeck, Shaikh Ahmed, Clemens Heitzinger, Neerav Kharche, Muhammad Usman, Mathieu Luisier, Raseong Kim, Neophytos Neophytou, Michael McLennan, and Timothy B. Boykin, "Quantum Dot, Nanowire, Bandstructure Modeling and Deployment on nanoHUB.org", International Topical Workshop on Tera- and Nano-Devices: Physics and Modeling, University of Aizu, Aizu-Wakamatsu, Japan, October 16-19, 2006. (Poster Presentation) 

103. Sebastien Goasguen, Jon Camden, Muhammad Usman, Steven Clark, Jaime Frey, Clemens Heitzinger, and Gerhard Klimeck, "nanoHUB - nanoscience gateway to the TeraGrid", TeraGrid 2006, Indianapolis, IN, June 12-15, 2006. (Poster Presentation) 

104. Muhammad Usman and Noor M. Sheikh, "Performance analysis of adaptive source rate control (ASRC) algorithm for VoIP", TENCON 2005, IEEE region 10 conference Melbourne Australia November 2005, Pages: 1-7. (Poster Presentation)