121 citations · 304 across the 26 of their papers we have counts for
26 papers
Hybrid Heralded Noiseless Amplification with Finite-Cutoff Quantum Scissors
Haixi Miao, Timothy C. Ralph
A noiseless linear amplifier (NLA) can probabilistically amplify an optical state without the noise required by deterministic phase-insensitive amplification. We study a hybrid amp…
Observing relativistic trajectories of single photons
Sayantan Das, Daniel S. Dahl, Daniel Peace +6
While the standard interpretation of quantum mechanics does not assign definite trajectories to particles, the Bohmian interpretation does. Only recently has an operational method…
Co-transmission of classical data and continuous-variable entanglement over a single quantum channel
Nicholas Zaunders, Timothy C. Ralph
Displacement-based simultaneous quantum-classical communications (SQCC) protocols, as originally proposed, are generally incompatible with the majority of useful quantum communicat…
Can a quantum circuit detect the Unruh effect?
Pravin Kumar Dahal, Timothy C. Ralph, William J. Munro +2
The Unruh effect predicts that an accelerating observer perceives the Minkowski vacuum as a thermal bath, yet direct detection remains experimentally inaccessible. Its timelike cou…
Generalised simultaneous transmission of arbitrary quantum states and classical information
Nicholas Zaunders, Timothy C. Ralph
We present a protocol which allows for arbitrary optical quantum states to simultaneously carry and transmit classical data, without sacrificing the integrity of either the quantum…
Time-energy uncertainty relation from subcycle mode vacuum fluctuations of a quantum field
Achintya Sajeendran, Timothy C. Ralph
The time-energy uncertainty relation is often invoked as a heuristic explanation for virtual particles in interacting quantum field theories. However, this interpretation breaks do…
Enhancing Long-distance Continuous-variable Quantum-key-distribution with an Error-correcting Relay
S. Nibedita Swain, Ryan J. Marshman, Josephine Dias +2
Noiseless linear amplifiers (NLAs) serve as an effective means to enable long-distance continuous-variable (CV) quantum key distribution (QKD), even under realistic conditions with…
Utility of noiseless linear amplification and attenuation in single-rail discrete-variable quantum communications
Ozlem Erkilic, Aritra Das, Angela A. Baiju +3
Quantum communication offers many applications, with teleportation and superdense coding being two of the most fundamental. In these protocols, pre-shared entanglement enables eith…
Software-enhanced simultaneous quantum-classical communication protocol with Gaussian post-selection
Ozlem Erkilic, Biveen Shajilal, Nicholas Zaunders +1
Simultaneous quantum-classical communication (SQCC) protocols offer a practical approach to continuous-variable quantum key distribution (CV-QKD) by encoding quantum and classical…
Entanglement distribution via satellite: an evaluation of competing protocols assuming realistic free-space optical channels
Nicholas Zaunders, Timothy C. Ralph
A key technical requirement of any future quantum network is the ability to distribute quantum-entangled resources between two spatially separated points at a high rate and high fi…
Stokes Parameters and Dual Classical-Quantum Signaling
Anjali Dhiman, Ziqing Wang, Timothy C. Ralph +2
Catering to emerging satellite-based free-space optical (FSO) communication networks and exploiting polarization encoding via Stokes operators, we propose a novel simultaneous quan…
Noise-reduction of multimode Gaussian Boson Sampling circuits via Unitary Averaging
S. Nibedita Swain, Ryan J. Marshman, Alexander S. Solntsev +1
We improve Gaussian Boson Sampling (GBS) circuits by integrating the unitary averaging (UA) protocol, previously demonstrated to protect unknown Gaussian states from phase errors […
Enhanced Simultaneous Quantum-Classical Communications Under Composable Security
Nicholas Zaunders, Ziqing Wang, Robert Malaney +2
Simultaneous quantum-classical communications (SQCC) protocols are a family of continuous-variable quantum key distribution (CV-QKD) protocols which allow for quantum and classical…
General relativistic particle trajectories via quantum mechanical weak values and the Schwarzschild-Alcubierre spacetime
Joshua Foo, Cameron Bellamy, Timothy C. Ralph
We show that the average trajectories of relativistic quantum particles in Schwarzschild spacetime, obtained via quantum mechanical weak measurements of momentum and energy, are eq…
Noise Transfer Approach to GKP Quantum Circuits
Timothy C Ralph, Matthew Winnel, S Nibedita Swain +1
The choice between the Schroedinger and Heisenberg pictures can significantly impact the computational resources needed to solve a problem, even though they are equivalent formulat…
Looping back to the past through free fall in a controlled warp drive spacetime
Achintya Sajeendran, Timothy C. Ralph
We present a modification to a 'rotating' version of the dynamical Alcubierre spacetime, which was previously shown to permit closed timelike curves. We find that if the effective…
Quantum state tomography on closed timelike curves using weak measurements
Lachlan G. Bishop, Fabio Costa, Timothy C. Ralph
Any given prescription of quantum time travel necessarily endows a Hilbert space to the chronology-violating (CV) system on the closed timelike curve (CTC). However, under the two…
Exploiting Spatial Diversity in Earth-to-Satellite Quantum-Classical Communications
Ziqing Wang, Timothy C. Ralph, Ryan Aguinaldo +1
Despite being an integral part of the vision of quantum Internet, Earth-to-satellite (uplink) quantum communications have been considered more challenging than their satellite-to-E…
Quantum-Amplified Simultaneous Quantum-Classical Communications
Nicholas Zaunders, Ziqing Wang, Timothy C. Ralph +2
Classical free-space optical (FSO) communication promises massive data throughput rates relative to traditional wireless technologies - an attractive outcome now being pursued in t…
Quantum effects in rotating reference frames
Sebastian P. Kish, Timothy C. Ralph
We consider the time delay of interfering single photons oppositely traveling in the Kerr metric of a rotating massive object. Classically, the time delay shows up as a phase diffe…
Spacetime effects on satellite-based quantum communications
David Edward Bruschi, Tim Ralph, Ivette Fuentes +2
We investigate the consequences of space-time being curved on space-based quantum communication protocols. We analyze tasks that require either the exchange of single photons in a…
Quantum state cloning in the presence of a closed timelike curve
D. Ahn, C. R. Myers, T. C. Ralph +1
The possible existence of closed timelike curves (CTCs) draws attention to fundamental questions about what is physically possible and what is not. An example is the "no cloning th…
Reply to comment on "Information Flow of quantum states interacting with closed timelike curves"
T. C. Ralph, C. R. Myers
We respond to the comment by Klobus, et al by emphasizing that the equivalent circuit, once constructed, obeys the standard rules of quantum mechanics - hence there is no ambiguity…
Quantum fields on closed time-like curves
J. L. Pienaar, C. R. Myers, T. C. Ralph
Recently, there has been much interest in the evolution of quantum particles on closed time-like curves (CTCs). However, such models typically assume point-like particles with only…