187 citations · 736 across the 22 of their papers we have counts for
22 papers
Rigorous no-go theorems for heralded linear-optical state generation tasks
Deepesh Singh, Ryan J. Marshman, Luis Villegas-Aguilar +2
A major challenge in photonic quantum technologies is developing strategies to prepare suitable discrete-variable quantum states using simple input states, linear optics, and auxil…
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…
A Spin-Based Pathway to Testing the Quantum Nature of Gravity
Sougato Bose, Anupam Mazumdar, Roger Penrose +52
A key open problem in physics is the correct way to combine gravity (described by general relativity) with everything else (described by quantum mechanics). This problem suggests t…
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 […
Coherently mitigating boson samplers with stochastic errors
Deepesh Singh, Ryan J. Marshman, Nathan Walk +3
Sampling experiments provide a viable route to show quantum advantages of quantum devices over classical computers in well-defined computational tasks. However, quantum devices suc…
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…
Improving Continuous-variable Quantum Channels with Unitary Averaging
S. Nibedita Swain, Ryan J. Marshman, Peter P. Rohde +3
A significant hurdle for quantum information and processing using bosonic systems is stochastic phase errors which occur as the photons propagate through a channel. These errors wi…
Entanglement of Magnetically Levitated Massive Schrödinger Cat States by Induced Dipole Interaction
Ryan J. Marshman, Sougato Bose, Andrew Geraci +1
Quantum entanglement provides a novel way to test short-distance quantum physics in a non-relativistic regime. We provide entanglement-based protocols to potentially test the magne…
Unitary Averaging with Fault and Loss Tolerance
Ryan J. Marshman, Deepesh Singh, Timothy C. Ralph +1
We consider the impact of the unitary averaging framework on single and two-mode linear optical gates. We demonstrate that this allows a trade-off between the probability of succes…
Gravito-diamagnetic forces for mass independent large spatial superpositions
Run Zhou, Ryan J. Marshman, Sougato Bose +1
Creating a massive spatial quantum superposition, such as the Schrödinger cat state, where the mass and the superposition size within the range kg and $Δx \sim…
Mass-independent scheme for enhancing spatial quantum superpositions
Run Zhou, Ryan J. Marshman, Sougato Bose +1
Placing a large mass in a large spatial superposition, such as a Schrödinger Cat state is a significant and important challenge. In particular, the large spatial superposition (${\…
Catapulting towards massive and large spatial quantum superposition
Run Zhou, Ryan J. Marshman, Sougato Bose +1
Large spatial quantum superposition of size for mass is required to probe the foundations of quantum mechanics…
Entanglement based tomography to probe new macroscopic forces
Peter F. Barker, Sougato Bose, Ryan J. Marshman +1
Quantum entanglement provides a novel way to test short distance physics in the non-relativistic regime. We will provide a protocol to {\it potentially} test new physics by bringin…
Improving resilience of the Quantum Gravity Induced Entanglement of Masses (QGEM) to decoherence using 3 superpositions
Martine Schut, Jules Tilly, Ryan J. Marshman +2
Recently a protocol called quantum gravity induced entanglement of masses (QGEM) that aims to test the quantum nature of gravity using the entanglement of 2 qubits was proposed. Th…
Constructing Nano-Object Quantum Superpositions with a Stern-Gerlach Interferometer
Ryan J. Marshman, Anupam Mazumdar, Ron Folman +1
Probing quantum mechanics, quantum aspects of general relativity along with the sensing and the constraining of classical gravity can all be enabled by unprecedented spatial sizes…
Qudits for Witnessing Quantum Gravity Induced Entanglement of Masses Under Decoherence
Jules Tilly, Ryan J. Marshman, Anupam Mazumdar +1
Recently a theoretical and an experimental protocol known as quantum gravity induced entanglement of masses (QGEM) has been proposed to test the quantum nature of gravity using two…
Relative Acceleration Noise Mitigation for Nanocrystal Matter-wave Interferometry: Application to Entangling Masses via Quantum Gravity
Marko Toroš, Thomas W. van de Kamp, Ryan J. Marshman +3
Matter wave interferometers with large momentum transfers, irrespective of specific implementations, will face a universal dephasing due to relative accelerations between the inter…
Quantum Gravity Witness via Entanglement of Masses: Casimir Screening
Thomas W. van de Kamp, Ryan J. Marshman, Sougato Bose +1
A recently proposed experimental protocol for Quantum Gravity induced Entanglement of Masses (QGEM) requires in principle realizable, but still very ambitious, set of parameters in…
Quantum optical levitation of a mirror
C. T. Marco Ho, Ryan J. Marshman, Robert B. Mann +1
While the levitating mirror has seen renewed interest lately, relatively little is known about its quantum behaviour. In this paper we present a quantum theory of a one dimensional…
Locality & Entanglement in Table-Top Testing of the Quantum Nature of Linearized Gravity
Ryan J. Marshman, Anupam Mazumdar, Sougato Bose
This paper points out the importance of the assumption of locality of physical interactions, and the concomitant necessity of propagation of an entity (in this case, off-shell quan…
Mesoscopic Interference for Metric and Curvature (MIMAC) & Gravitational Wave Detection
Ryan J. Marshman, Anupam Mazumdar, Gavin W. Morley +3
A compact detector for space-time metric and curvature is highly desirable. Here we show that quantum spatial superpositions of mesoscopic objects, of the type which would in princ…
Passive quantum error correction of linear optics networks through error averaging
Ryan J. Marshman, Austin P. Lund, Peter P. Rohde +1
We propose and investigate a method of error detection and noise correction for bosonic linear networks using a method of unitary averaging. The proposed error averaging does not r…