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

429 works between 1991 and 2025
All (429) Journal Article (325) Book Chapter (7) Conference Publication (87) Book (2) Other Outputs (8)

361 - 380 of 429 works

2002

Journal Article

Nondeterministic gates for photonic single-rail quantum logic

Lund, A. P. and Ralph, T. C. (2002). Nondeterministic gates for photonic single-rail quantum logic. Physical Review A - Atomic, Molecular, and Optical Physics, 66 (3). doi: 10.1103/PhysRevA.66.032307

Nondeterministic gates for photonic single-rail quantum logic

2002

Journal Article

Linear Optical CNOT Gate in the Coincidence Basis

Ralph, T. C., Langford, N. K., Bell, T. B. and White, A. G. (2002). Linear Optical CNOT Gate in the Coincidence Basis. Physical Review A, 65 (6) 062324, 062324-1-062324-5. doi: 10.1103/PhysRevA.65.062324

Linear Optical CNOT Gate in the Coincidence Basis

2002

Journal Article

Teleportation improvement by conditional measurements on the two-mode squeezed vacuum

Cochrane, P. T., Ralph, T. C. and Milburn, G. J. (2002). Teleportation improvement by conditional measurements on the two-mode squeezed vacuum. Physical Review A, 65 (6) 062306, 062306-1-062306-6. doi: 10.1103/PhysRevA.65.062306

Teleportation improvement by conditional measurements on the two-mode squeezed vacuum

2002

Journal Article

Continuous Variable Quantum Cryptography:Beating the 3dB Loss Limit

Silberhorn, C, Ralph, T. C., Lutkenhaus, N. and Leuchs, G (2002). Continuous Variable Quantum Cryptography:Beating the 3dB Loss Limit. Physical Review Letters, 89 (16) 167901, 167901-1-167901-4. doi: 10.1103/PhysRevLett.89.167901

Continuous Variable Quantum Cryptography:Beating the 3dB Loss Limit

2002

Journal Article

Quantum teleportation with Einstein-Podolsky-Rosen optical entanglement

Lam, P. K., Bowen, W. P. and Ralph, T. C. (2002). Quantum teleportation with Einstein-Podolsky-Rosen optical entanglement. The Physicist, 39 (3: 72)

Quantum teleportation with Einstein-Podolsky-Rosen optical entanglement

2002

Journal Article

Unconditional continuous-variable dense coding

Ralph, T. C. and Huntington, E. H. (2002). Unconditional continuous-variable dense coding. Physical Review A - Atomic, Molecular, and Optical Physics, 66 (4). doi: 10.1103/PhysRevA.66.042321

Unconditional continuous-variable dense coding

2002

Journal Article

Separating the quantum sidebands of an optical field

Huntington, EH and Ralph, TC (2002). Separating the quantum sidebands of an optical field. Journal of Optics B-quantum And Semiclassical Optics, 4 (2), 123-128. doi: 10.1088/1464-4266/4/2/307

Separating the quantum sidebands of an optical field

2002

Journal Article

Unconditional continuous-variable dense coding

Ralph, T. C. and Huntington, E.H. (2002). Unconditional continuous-variable dense coding. Physical Review A, 66 (042321) 042321, 042321-1-042321-4. doi: 10.1103/PhysRevA.66.042321

Unconditional continuous-variable dense coding

2002

Journal Article

Linear optical controlled-NOT gate in the coincidence basis

Ralph, T. C., Langford, N. K., Bell, T. B. and White, A. G. (2002). Linear optical controlled-NOT gate in the coincidence basis. Physical Review A - Atomic, Molecular, and Optical Physics, 65 (6). doi: 10.1103/PhysRevA.65.062324

Linear optical controlled-NOT gate in the coincidence basis

2001

Other Outputs

Quantum Computation with Coherent States, Linear Interactions and Superposed Resources

Ralph, T. C., Munro, W. J. and Milburn, Gerard J. (2001). Quantum Computation with Coherent States, Linear Interactions and Superposed Resources.

Quantum Computation with Coherent States, Linear Interactions and Superposed Resources

2001

Other Outputs

Conditional Two Mode Squeezed Vacuum Teleportation

Cochrane, P. T., Ralph, T. C. and Milburn, Gerard J. (2001). Conditional Two Mode Squeezed Vacuum Teleportation.

Conditional Two Mode Squeezed Vacuum Teleportation

2001

Journal Article

Continuous-variable Bell-type correlations from two bright squeezed beams

Huntington, E.H. and Ralph, T. C. (2001). Continuous-variable Bell-type correlations from two bright squeezed beams. Physical Review A, 65 (1) 012306, 012306-1-012306-9. doi: 10.1103/PhysRevA.65.012306

Continuous-variable Bell-type correlations from two bright squeezed beams

2001

Conference Publication

Teleportation criteria: form and signifcance

Ralph, T. C. (2001). Teleportation criteria: form and signifcance. TAMU-ONR Workshop, Jackson, Wyoming, USA, 26-30 July, 1999. Berlin / Heidelberg: Springer. doi: 10.1007/3-540-40894-0_17

Teleportation criteria: form and signifcance

2001

Journal Article

Efficient linear optics quantum coputation

Milburn, G. J., Ralph, T. C., White, A. G., Knill, E and Laflamme, R (2001). Efficient linear optics quantum coputation. Implementation of Quantum Computation, 1 (SUPPL. 1), 13-19.

Efficient linear optics quantum coputation

2001

Conference Publication

Optical quantum information processing: Experiments with CW laser light

Bachor, HA, Lam, PK, Bowen, W, Schnabel, R, Bennetts, S, Buchler, B, Andersen, UL and Ralph, TC (2001). Optical quantum information processing: Experiments with CW laser light. 1st International Conference on Experimental Implementation of Quantum Computation, Sydney Australia, Jan 16-19, 2001. PRINCETON: RINTON PRESS, INC.

Optical quantum information processing: Experiments with CW laser light

2001

Journal Article

Squeezing more from a quantum nondemolition measurement

Buchler, B. C., Lam, P. K., Bachor, H. A., Andersen, U. L. and Ralph, T. C. (2001). Squeezing more from a quantum nondemolition measurement. Physical Review A, 65 (1), 0118031-0118034. doi: 10.1103/PhysRevA.65.011803

Squeezing more from a quantum nondemolition measurement

2001

Conference Publication

Optical quantum information processing: experiments with CW laser light

Bachor, Hans-A., Lam, P. K., Bowen, W. P., Schnabel, R., Bennetts, S., Buchler, B. C. and Ralph, T. C. (2001). Optical quantum information processing: experiments with CW laser light. 1st International Conference on Experimental Implementation of Quantum Computation, Australian National Maritime Museum, Sydney, 16th-19th January, 2001. Rinton Press Inc.

Optical quantum information processing: experiments with CW laser light

2001

Journal Article

Interferometric tests of teleportation

Ralph, T. C. (2001). Interferometric tests of teleportation. Physical Review A, 65 (1) 012319, 012319-1-012319-12. doi: 10.1103/PhysRevA.65.012319

Interferometric tests of teleportation

2001

Journal Article

Quantum noise transfer functions: A practical tool in quantum optics

Bachor, H.A. and Ralph, T. C. (2001). Quantum noise transfer functions: A practical tool in quantum optics. Lecture Notes in Physics, 561, 313-332.

Quantum noise transfer functions: A practical tool in quantum optics

2000

Journal Article

Mach-Zehnder interferometer and the teleporter

Ralph, TC (2000). Mach-Zehnder interferometer and the teleporter. Physical Review a, 61 (4) 044301. doi: 10.1103/PhysRevA.61.044301

Mach-Zehnder interferometer and the teleporter

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

  • 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

    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

    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

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