Overview
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
Qualifications
- Bachelor (Honours) of Science (Advanced), Macquarie University
- Doctor of Philosophy, Australian National University
Research interests
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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.
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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.
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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.
Works
Search Professor Timothy Ralph’s works on UQ eSpace
2024
Conference Publication
Quantum-amplified simultaneous quantum-classical communications
Zaunders, Nicholas, Wang, Ziqing, Ralph, Timothy C., Aguinaldo, Ryan and Malaney, Robert (2024). Quantum-amplified simultaneous quantum-classical communications. 2024 International Conference on Quantum Communications, Networking, and Computing (QCNC), Kanazawa, Japan, 1-3 July 2024. Piscataway, NJ, United States: IEEE. doi: 10.1109/qcnc62729.2024.00033
2024
Journal Article
Saturating the Maximum Success Probability Bound for Noiseless Linear Amplification Using Linear Optics
Guanzon, Joshua J., Winnel, Matthew S., Singh, Deepesh, Lund, Austin P. and Ralph, Timothy C. (2024). Saturating the Maximum Success Probability Bound for Noiseless Linear Amplification Using Linear Optics. PRX Quantum, 5 (2) 020359. doi: 10.1103/prxquantum.5.020359
2024
Journal Article
Deterministic Preparation of Optical Squeezed Cat and Gottesman-Kitaev-Preskill States
Winnel, Matthew S., Guanzon, Joshua J., Singh, Deepesh and Ralph, Timothy C. (2024). Deterministic Preparation of Optical Squeezed Cat and Gottesman-Kitaev-Preskill States. Physical Review Letters, 132 (23) 230602. doi: 10.1103/physrevlett.132.230602
2024
Journal Article
Classical-quantum dual encoding for laser communications in space
Winnel, Mathew, Wang, Ziqing, Malaney, Robert, Aguinaldo, Ryan, Green, Jonathan and Ralph, Timothy C. (2024). Classical-quantum dual encoding for laser communications in space. New Journal of Physics, 26 (3) 033012, 1-14. doi: 10.1088/1367-2630/ad295a
2024
Journal Article
Measurement-based Lorentz-covariant Bohmian trajectories of interacting photons
Foo, Joshua, Lund, Austin P. and Ralph, Timothy C. (2024). Measurement-based Lorentz-covariant Bohmian trajectories of interacting photons. Physical Review A, 109 (2) 022229. doi: 10.1103/physreva.109.022229
2023
Journal Article
Noiseless linear amplification and loss-tolerant quantum relay using coherent-state superpositions
Guanzon, Joshua J., Winnel, Matthew S., Lund, Austin P. and Ralph, Timothy C. (2023). Noiseless linear amplification and loss-tolerant quantum relay using coherent-state superpositions. Physical Review A, 108 (3) 032411, 1-14. doi: 10.1103/physreva.108.032411
2023
Journal Article
Enhancing quantum teleportation efficacy with noiseless linear amplification
Zhao, Jie, Jeng, Hao, Conlon, Lorcán O., Tserkis, Spyros, Shajilal, Biveen, Liu, Kui, Ralph, Timothy C., Assad, Syed M. and Lam, Ping Koy (2023). Enhancing quantum teleportation efficacy with noiseless linear amplification. Nature Communications, 14 (1) 4745, 1-8. doi: 10.1038/s41467-023-40438-z
2023
Journal Article
Protecting classical-quantum signals in free-space optical channels
Villaseñor, E., Winnel, M. S., Ralph, T. C., Aguinaldo, R., Green, J. and Malaney, R. (2023). Protecting classical-quantum signals in free-space optical channels. Physical Review A, 107 (6) 062616. doi: 10.1103/physreva.107.062616
2023
Journal Article
Pump depletion in optical parametric amplification
Xing, Wanli and Ralph, T. C. (2023). Pump depletion in optical parametric amplification. Physical Review A, 107 (2) 023712. doi: 10.1103/physreva.107.023712
2022
Journal Article
Comparison of techniques for distillation of entanglement over a lossy channel
Mauron, Caroline and Ralph, Timothy C. (2022). Comparison of techniques for distillation of entanglement over a lossy channel. Physical Review A, 106 (6) 062603. doi: 10.1103/physreva.106.062603
2022
Journal Article
Achieving the ultimate end-to-end rates of lossy quantum communication networks
Winnel, Matthew S., Guanzon, Joshua J., Hosseinidehaj, Nedasadat and Ralph, Timothy C. (2022). Achieving the ultimate end-to-end rates of lossy quantum communication networks. npj Quantum Information, 8 (1) 129, 1-9. doi: 10.1038/s41534-022-00641-0
2022
Journal Article
Distributing entanglement in first-generation discrete- and continuous-variable quantum repeaters
Dias, Josephine, Winnel, Matthew S., Munro, William J., Ralph, T. C. and Nemoto, Kae (2022). Distributing entanglement in first-generation discrete- and continuous-variable quantum repeaters. Physical Review A, 106 (5) 052604, 1-9. doi: 10.1103/physreva.106.052604
2022
Journal Article
Universal quantum computation with optical four-component cat qubits
Su, Daiqin, Dhand, Ish and Ralph, Timothy C. (2022). Universal quantum computation with optical four-component cat qubits. Physical Review A, 106 (4) 042614. doi: 10.1103/physreva.106.042614
2022
Journal Article
Berry phase from the entanglement of future and past light cones: detecting the timelike Unruh effect
Quach, James Q., Ralph, Timothy C. and Munro, William J. (2022). Berry phase from the entanglement of future and past light cones: detecting the timelike Unruh effect. Physical Review Letters, 129 (16) 160401, 1-6. doi: 10.1103/physrevlett.129.160401
2022
Journal Article
Billiard-ball paradox for a quantum wave packet
Bishop, Lachlan G, Ralph, Timothy C and Costa, Fabio (2022). Billiard-ball paradox for a quantum wave packet. Classical and Quantum Gravity, 39 (17) 175007, 1-27. doi: 10.1088/1361-6382/ac8198
2022
Journal Article
Relativistic Bohmian trajectories of photons via weak measurements
Foo, Joshua, Asmodelle, Estelle, Lund, Austin P. and Ralph, Timothy C. (2022). Relativistic Bohmian trajectories of photons via weak measurements. Nature Communications, 13 (1) 4002, 4002. doi: 10.1038/s41467-022-31608-6
2022
Journal Article
Ideal quantum teleamplification up to a selected energy cutoff using linear optics
Guanzon, Joshua J., Winnel, Matthew S., Lund, Austin P. and Ralph, Timothy C. (2022). Ideal quantum teleamplification up to a selected energy cutoff using linear optics. Physical Review Letters, 128 (16) 160501, 160501. doi: 10.1103/physrevlett.128.160501
2022
Journal Article
Quantum channel correction outperforming direct transmission
Slussarenko, Sergei, Weston, Morgan M., Shalm, Lynden K., Verma, Varun B., Nam, Sae-Woo, Kocsis, Sacha, Ralph, Timothy C. and Pryde, Geoff J. (2022). Quantum channel correction outperforming direct transmission. Nature Communications, 13 (1) 1832, 1832. doi: 10.1038/s41467-022-29376-4
2022
Journal Article
Realizing a rapidly switched Unruh-DeWitt detector through electro-optic sampling of the electromagnetic vacuum
Onoe, Sho, Guedes, Thiago L. M., Moskalenko, Andrey S., Leitenstorfer, Alfred, Burkard, Guido and Ralph, Timothy C. (2022). Realizing a rapidly switched Unruh-DeWitt detector through electro-optic sampling of the electromagnetic vacuum. Physical Review D, 105 (5) 056023. doi: 10.1103/PhysRevD.105.056023
2022
Journal Article
Telefilters, telemirrors, and causality
Foo, Joshua, Onoe, Sho, Zych, Magdalena and Ralph, Timothy C. (2022). Telefilters, telemirrors, and causality. Physical Review A, 105 (3) 033711. doi: 10.1103/physreva.105.033711
Funding
Current funding
Supervision
Availability
- Professor Timothy Ralph is:
- Available for supervision
Before you email them, read our advice on how to contact a supervisor.
Available projects
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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
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Doctor Philosophy
Beyond quantum field theory on a curved background
Principal Advisor
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Doctor Philosophy
Practical applications of quantum sampling algorithms
Principal Advisor
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Master Philosophy
Quantum effects in general relativistic spacetimes
Principal Advisor
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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
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Doctor Philosophy
Quantum mechanics near closed timelike curves
Principal Advisor
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Doctor Philosophy
Demonstration of relativistic Bohmian trajectories of photons
Associate Advisor
Other advisors: Dr Daniel Peace, Associate Professor Jacqui Romero
Completed supervision
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2024
Doctor Philosophy
Advancements in quantum information protocols using quantum optics
Principal Advisor
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2023
Doctor Philosophy
Fundamental aspects of quantum foundations, field theory, and gravity
Principal Advisor
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2021
Doctor Philosophy
Gaussian Quantum Information in Relativistic Quantum Field Theory for Flat Space-Time
Principal Advisor
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2020
Doctor Philosophy
Entanglement Theory and its Applications in Gaussian Quantum Information
Principal Advisor
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2020
Doctor Philosophy
Characteristics of unification: exploring the tension between quantum and gravitational physics
Principal Advisor
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2017
Doctor Philosophy
Quantum effects in non-inertial frames and curved spacetimes
Principal Advisor
Other advisors: Professor Gerard Milburn
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2015
Doctor Philosophy
Quantum correlations and information in linear-optical networks
Principal Advisor
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2010
Doctor Philosophy
Requirements on nonlinear optical quantum gates
Principal Advisor
Other advisors: Professor Gerard Milburn
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2009
Doctor Philosophy
Continuous Variable Quantum Information and Quantum Computation
Principal Advisor
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2009
Doctor Philosophy
Quantum complexity, Emergence and Computation by Measurement On what computers reveal about physical laws, and what physical laws reveal about computers.
Principal Advisor
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2008
Doctor Philosophy
Optical quantum information with non-gaussian states
Principal Advisor
Other advisors: Professor Gerard Milburn
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2002
Doctor Philosophy
PHYSICAL CHARACTERIZATIONS OF QUANTUM ENTANGLEMENT
Principal Advisor
Other advisors: Professor Gerard Milburn
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2012
Doctor Philosophy
Quantum Estimation for Gravitation and Quantum Information with Acceleration
Associate Advisor
Other advisors: Professor Gerard Milburn
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2004
Doctor Philosophy
UNIVERSALITY IN QUANTUM COMPUTATION
Associate Advisor
Other advisors: Professor Gerard Milburn
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Doctor Philosophy
ENCODING, MANIPULATING AND MEASURING QUANTUM INFORMATION IN OPTICS
Associate Advisor
Other advisors: Professor Andrew White
Media
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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