Professor Timothy Ralph
Professor

Timothy Ralph

Email: 
Phone: 
+61 7 334 69693

Background

Professor Ralph obtained a BSc Hons from Macquarie University in 1989 and a PhD in Physics from The Australian National University in 1993. He has held three Australian Research Council Fellowships - Postdoctoral, QEII and Professorial. He is currently Node Director for the ARC Centre of Excellence for Quantum Computation and Communication Technology at the University of Queensland.

Availability

Professor Timothy Ralph is:
Available for supervision
Media expert

Fields of research

Physical Sciences

Qualifications

  • Bachelor (Honours) of Science (Advanced), Macquarie University
  • Doctor of Philosophy, Australian National University

Research interests

  • Linear Optics Quantum Computation.

    As part of the Centre for Quantum Computation and Communication Technology we are attempting to understand and implement simple quantum gates using the techniques of linear optics and measurement induced state projection.

  • Quantum Communication with Lasers.

    Quantum information techniques allow one to communicate with absolute security, amongst other applications. As part of the Centre for Quantum Computation and Communication Technology we are developing such secure communication protocols based on sending coherent states of light and measuring their amplitudes.

  • Relativistic Quantum Information.

    This project examines the interface between quantum mechanics, general relativity and information theory. It asks, both at a fundamental and practical level, what the ramifications for quantum information theory are when space-time curvature and rapid motion are introduced.

Search Professor Timothy Ralph’s works on UQ eSpace

430 works between 1991 and 2025
All (430) Journal Article (326) Book Chapter (7) Conference Publication (87) Book (2) Other Outputs (8)

201 - 220 of 430 works

2010

Conference Publication

Quantum information science with photonic chips

Politi, Alberto, Matthews, Jonathan C. F., Laing, Anthony, Peruzzo, Alberto, Kalasuwan, Pruet, Zhou, Xiao-Qi, Verde, Maria Rodas, Rarity, John G., Stefanov, Andre, Ralph, Timothy C., Thompson, Mark G. and O'Brien, Jeremy L. (2010). Quantum information science with photonic chips. ECOC 2010: 36th European Conference and Exhibition on Optical Communication, Torino, Italy, 19-23 September, 201. Piscataway, NJ, United States: Institute of Electrical and Electronics Engineers. doi: 10.1109/ECOC.2010.5621301

Quantum information science with photonic chips

2010

Journal Article

Optical Quantum Computation

Ralph, Tim C. and Pryde, Geoff J. (2010). Optical Quantum Computation. Progress in Optics, 54 (C), 209-269. doi: 10.1016/S0079-6638(10)05409-0

Optical Quantum Computation

2010

Conference Publication

Coherent state quantum key distribution with continuous-wave laser beams

Symul, T., Sharma, V., Ralph, T. C. and Lam, P. K. (2010). Coherent state quantum key distribution with continuous-wave laser beams. OFC/NFOEC 2010: Conference on Optical Fiber Communication, collocated National Fiber Optic Engineers Conference, San Diego, CA, USA, 21-25 March, 2010. Piscataway, NJ, United States: I E E E. doi: 10.1364/OFC.2010.OWC6

Coherent state quantum key distribution with continuous-wave laser beams

2010

Conference Publication

Advances in photonic quantum information science

Politi, Alberto, Matthews, Jonathan C. F., Laing, Anthony, Peruzzo, Alberto, Kalasuwan, Pruet, Zhou, Xiao-Qi, Rodas, Maria, Cryan, Martin J., Rarity, John G., Stefanov, Andre, Ralph, Timothy C., Yu, Siyuan, Thompson, Mark G. and O'Brien, Jeremy L. (2010). Advances in photonic quantum information science. CLEO/QELS: 2010 Laser Science to Photonic Applications. Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), San Jose, CA, USA, 16-21 May, 2010. Piscataway, NJ, USA: IEEE. doi: 10.1364/IPRSN.2010.IMA2

Advances in photonic quantum information science

2010

Conference Publication

Event operators and quantum gates

Pienaar, Jacques and Ralph, Timothy C. (2010). Event operators and quantum gates. FFP10: Tenth International Symposium. Frontiers of Fundamental and Computational Physics 2009, Perth, WA, Australia, 24-26 November, 2009. College Park, MD, United States: American Institute of Physics. doi: 10.1063/1.3460194

Event operators and quantum gates

2010

Conference Publication

Adaptive optical phase estimation

Nakane, D., Wheatley, T. A., Berry, D. W., Yonezawa, H., Arao, H., Pope, D. T., Ralph, T. C., Wiseman, H. M., Huntington, E. H. and Furusawa, A. (2010). Adaptive optical phase estimation. CLEO/QELS: 2010 Laser Science to Photonic Applications. Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), San Jose, CA, USA, 16-21 May, 2010. Piscataway, NJ, USA: IEEE. doi: 10.1364/CLEO.2010.JThF4

Adaptive optical phase estimation

2010

Other Outputs

Entanglement between the future and past in the quantum vacuum

Olson, S. Jay and Ralph, Timothy C. (2010). Entanglement between the future and past in the quantum vacuum.

Entanglement between the future and past in the quantum vacuum

2010

Conference Publication

Generation of a comb of vacuum squeezing over 2.4 GHz for multiplexed communication

Heurs, M., Webb, J. G., Ralph, T. C. and Huntington, E. H. (2010). Generation of a comb of vacuum squeezing over 2.4 GHz for multiplexed communication. CLEO/QELS: 2010 Laser Science to Photonic Applications. Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), San Jose, CA, USA, 16-21 May, 2010. Piscataway, NJ, USA: IEEE. doi: 10.1364/QELS.2010.QFA2

Generation of a comb of vacuum squeezing over 2.4 GHz for multiplexed communication

2009

Journal Article

A bright future for quantum communications

Ralph, Timothy C. and Lam, Ping K. (2009). A bright future for quantum communications. Nature Photonics, 3 (12), 671-673. doi: 10.1038/nphoton.2009.222

A bright future for quantum communications

2009

Journal Article

Editorial introduction to the special issue on quantum communications and information science

Kumar, Prem, Kwiat, Paul G., Ralph, Tim and Sasaki, Masahide (2009). Editorial introduction to the special issue on quantum communications and information science. IEEE Journal of Selected Topics in Quantum Electronics, 15 (6) 5340090, 1545-1546. doi: 10.1109/JSTQE.2009.2035480

Editorial introduction to the special issue on quantum communications and information science

2009

Journal Article

Continuous-variable entanglement distillation over a general lossy channel

Lund, A. P. and Ralph, T. C. (2009). Continuous-variable entanglement distillation over a general lossy channel. Physical Review A - Atomic, Molecular, and Optical Physics, 80 (3) 032309, 032309-1-032309-9. doi: 10.1103/PhysRevA.80.032309

Continuous-variable entanglement distillation over a general lossy channel

2009

Journal Article

Quantum computing with continuous-variable clusters

Gu, Mile, Weedbrook, Christian, Menicucci, Nicholas C., Ralph, Timothy C. and van Loock, Peter (2009). Quantum computing with continuous-variable clusters. Physical Review A (Atomic, Molecular and Optical Physics), 79 (6) 062318, 062318.1-062318.16. doi: 10.1103/PhysRevA.79.062318

Quantum computing with continuous-variable clusters

2009

Journal Article

Distinguishability of Gaussian states in quantum cryptography using postselection

Weedbrook, Christian, Alton, Daniel J., Symul, Thomas, Lam, Ping Kom and Ralph, Timothy C. (2009). Distinguishability of Gaussian states in quantum cryptography using postselection. Physical Review A (Atomic, Molecular and Optical Physics), 79 (6) 062311, 062311.1-062311.11. doi: 10.1103/PhysRevA.79.062311

Distinguishability of Gaussian states in quantum cryptography using postselection

2009

Journal Article

Spectral effects of strong X(2) nonlinearity for quantum processing

Leung, Patrick M., Munro, William J., Nemoto, Kae and Ralph, Timothy C. (2009). Spectral effects of strong X(2) nonlinearity for quantum processing. Physical Review A, 79 (4) 042307, 042307-1-042307-8. doi: 10.1103/PhysRevA.79.042307

Spectral effects of strong X(2) nonlinearity for quantum processing

2009

Journal Article

Quantum connectivity of space-time and gravitationally induced decorrelation of entanglement

Ralph, T. C., Milburn, G. J. and Downes, T. (2009). Quantum connectivity of space-time and gravitationally induced decorrelation of entanglement. Physical Review A, 79 (2) 022121, 022121-1-022121-8. doi: 10.1103/PhysRevA.79.022121

Quantum connectivity of space-time and gravitationally induced decorrelation of entanglement

2009

Journal Article

Failure of local realism revealed by extremely-coarse-grained measurements

Jeong, Hyunseok, Paternostro, Mauro and Ralph, Timothy C. (2009). Failure of local realism revealed by extremely-coarse-grained measurements. Physical Review Letters, 102 (6) 060403, 060403.1-060403.4. doi: 10.1103/PhysRevLett.102.060403

Failure of local realism revealed by extremely-coarse-grained measurements

2009

Journal Article

Simplifying quantum logic using higher-dimensional Hilbert spaces

Lanyon, Benjamin P., Barbieri, Marco, Almeida, Marcelo P., Jennewein, Thomas, Ralph, Timothy C., Resch, Kevin J., Pryde, Geoff J., O'Brien, Jeremy L., Gilchrist, Alexei and White, Andrew G. (2009). Simplifying quantum logic using higher-dimensional Hilbert spaces. Nature Physics, 5 (2), 134-140. doi: 10.1038/NPHYS1150

Simplifying quantum logic using higher-dimensional Hilbert spaces

2009

Journal Article

Violations of Bell's inequality for Gaussian states with homodyne detection and nonlinear interactions

Paternostro, M., Jeong, H. and Ralph, T. C. (2009). Violations of Bell's inequality for Gaussian states with homodyne detection and nonlinear interactions. Physical Review A, 79 (1) 012101, 012101-1-012101-7. doi: 10.1103/PhysRevA.79.012101

Violations of Bell's inequality for Gaussian states with homodyne detection and nonlinear interactions

2009

Conference Publication

Nondeterministic noiseless linear amplification of quantum systems

Ralph, T. C. and Lund, A. P. (2009). Nondeterministic noiseless linear amplification of quantum systems. Quantum Communication, Measurement and Computing (QCMC): Ninth International Conference on QCMC, Calgary, Canada, 19-24 August 2008. United States: American Institute of Physics. doi: 10.1063/1.3131295

Nondeterministic noiseless linear amplification of quantum systems

2009

Book Chapter

Optical quantum computation

Ralph, Tim C. and Pryde, Geoff J. (2009). Optical quantum computation. Progress in optics. (pp. 209-269) edited by Emil Wolf. Oxford, United Kingdom: Elsevier. doi: 10.1016/S0079-6638(10)05409-0

Optical quantum computation

Current funding

  • 2024 - 2027
    Deployable Quantum Relay (DSP Multi-Party Collaborative Project led by Griffith University)
    Commonwealth Defence Science and Technology Group
    Open grant
  • 2023 - 2025
    Quantum Communications with Continuous Variables (UNSW subcontract agreement)
    University of New South Wales
    Open grant
  • 2018 - 2025
    ARC Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) (ARC Centre of Excellence administered by UNSW)
    University of New South Wales
    Open grant

Past funding

  • 2021 - 2024
    A Space-Based Quantum Communications Platform using Continuous Variables (ARC Linkage Project led by University of NSW)
    University of New South Wales
    Open grant
  • 2019 - 2021
    Enabling quantum information technology with 60 photons and beyond
    United States Asian Office of Aerospace Research and Development
    Open grant
  • 2019 - 2020
    Platform independent studies on optimising quantum repeater architectures (Australian Department of Defence grant administered by QuintessenceLabs Pty Ltd)
    Quintessencelabs Pty Ltd
    Open grant
  • 2017 - 2020
    Quantum Key Distribution (QKD) System
    Quintessencelabs Pty Ltd
    Open grant
  • 2011 - 2018
    ARC Centre of Excellence for Quantum Computation and Communication Technology (ARC COE administered by the University of New South Wales)
    University of New South Wales
    Open grant
  • 2011 - 2013
    Quantum Optics and Quantum Information
    Vice-Chancellor's Senior Research Fellowship
    Open grant
  • 2010
    Quantum memory
    Australian National University
    Open grant
  • 2008 - 2012
    Quantum repeater technologies for continuous variable (ARC Discovery Project DP0879277 administered by ANU)
    Australian National University
    Open grant
  • 2006 - 2010
    Optical Quantum Computation
    ARC Discovery Projects
    Open grant
  • 2003 - 2010
    ARC Centre of Excellence for Quantum Computer Technology (UNSW lead institution)
    ARC Centres of Excellence
    Open grant
  • 2003 - 2005
    Quantum Photonics- Travel Award
    Australian National University
    Open grant
  • 2002 - 2004
    Towards Quantum Computation with Light
    UQ Foundation Research Excellence Awards - DVC(R) Funding
    Open grant
  • 2002 - 2004
    ARC Discovery Project - Quantum Photonics with continuous laser beams
    Australian National University
    Open grant
  • 2001 - 2004
    Experimental Implementation of Efficient Linear Optics Quantum Computation
    United States Army Research Office
    Open grant
  • 2000
    Optical entangler for Quantum Communication
    Australian National University
    Open grant
  • 2000 - 2005
    Quantum Information with Continuous Variables
    ARC Australian Research Fellowship/QEII F/ship
    Open grant
  • 2000
    Quantum information with continuous variables
    UQ New Staff Research Start-Up Fund
    Open grant

Availability

Professor Timothy Ralph is:
Available for supervision

Before you email them, read our advice on how to contact a supervisor.

Available projects

  • Optical Quantum Computation

    As part of the Centre for Quantum Computation and Communication Technology we are attempting to understand and implement optical quantum computation using the techniques of linear optic networks and measurement induced state projection. Projects are available examining intemediate scale protocols and algorithms as well as large scale architectures.

  • Quantum communication with lasers

    Quantum information techniques allow one to communicate with absolute security, amongst other applications. As part of the Centre for Quantum Computation and Communication Technology we are developing such secure communication protocols based on sending coherent and squeezed states of light and measuring their amplitudes. Projects concerning quantum repeaters for extending communication links and satellite to ground quantum communication are available.

  • Relativistic quantum information

    Projects are available that involve examining the interface between quantum mechanics, general relativity and information theory. They ask, both at a fundamental and practical level, what the ramifications for quantum information theory are when space-time curvature, rapid motion and/or very fast transformations are introduced.

Supervision history

Current supervision

  • Doctor Philosophy

    Production of quantum communication systems capable of operating onboard low-earth orbit satellites and developing integrated quantum and classical satellite communication protocols.

    Principal Advisor

  • Doctor Philosophy

    Practical applications of quantum sampling algorithms

    Principal Advisor

  • Master Philosophy

    Quantum effects in general relativistic spacetimes

    Principal Advisor

  • Doctor Philosophy

    Production of quantum communication systems capable of operating onboard low-earth orbit satellites and developing integrated quantum and classical satellite communication protocols.

    Principal Advisor

  • Master Philosophy

    Resolving paradoxes of closed timelike curves

    Principal Advisor

  • Doctor Philosophy

    Quantum mechanics near closed timelike curves

    Principal Advisor

  • Doctor Philosophy

    Beyond quantum field theory on a curved background

    Principal Advisor

  • Doctor Philosophy

    Perspectives on the de Broglie-Bohm interpretation

    Associate Advisor

    Other advisors: Associate Professor Sally Shrapnel, Dr Peter Evans

  • Doctor Philosophy

    Demonstration of relativistic Bohmian trajectories of photons

    Associate Advisor

    Other advisors: Dr Daniel Peace, Associate Professor Jacqui Romero

  • Doctor Philosophy

    Thermodynamic fluctuation relations for gravitating quantum systems

    Associate Advisor

    Other advisors: Dr Carolyn Wood, Dr Laura Henderson

Completed supervision

Enquiries

Contact Professor Timothy Ralph directly for media enquiries about:

  • Laser noise - physics
  • Optics - quantum
  • Physics
  • Quantum information
  • Quantum key distribution with continuous variables
  • Quantum optics
  • Quantum physics
  • Teleportation

Need help?

For help with finding experts, story ideas and media enquiries, contact our Media team:

communications@uq.edu.au