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quant-ph2026

Localized Covariant Quantities Appear To Underlie Quantum Circuits

Ken Wharton, Roderick Sutherland, Titus Amza +1

Although entangled state vectors cannot be fully described in terms of variables localized in space and time, any given entanglement experiment can be built from basic quantum circ…

quant-ph2025

Timing quantum emission: Coherence, superradiance, and entanglement in order

Nur Fadhillah Binti Rahimi, Norman Tze Wei Koo, Daniel Schumayer +3

We investigate the short-term temporal dynamics of superradiance in closely spaced quantum emitters. Building on Dickes 1954 framework, we analyze the sequential emergence of coher…

quant-ph2025

Optimal Displacement Sensing with Spin-Dependent Squeezed States

Liam J. Bond, Christophe H. Valahu, Athreya Shankar +2

Displacement sensing is a fundamental task in metrology. However, the development of quantum-enhanced sensors that fully utilize the available degrees of freedom in many-body quant…

quant-ph2025

Blind-spots of Randomized Benchmarking Under Temporal Correlations

Varun Srivastava, Abhinash Kumar Roy, Soumik Mahanti +3

Randomized benchmarking (RB) is a widely adopted protocol for estimating the average gate fidelity in quantum hardware. However, its standard formulation relies on the assumption o…

quant-ph2025★ 2 cited

Efficient Post-Selection for General Quantum LDPC Codes

Seok-Hyung Lee, Lucas H. English, Stephen D. Bartlett

Post-selection strategies that discard low-confidence computational results can significantly improve the effective fidelity of quantum error correction at the cost of reduced acce…

quant-ph2025★ 1 cited

Photonic Hybrid Quantum Computing

Jaehak Lee, Srikrishna Omkar, Yong Siah Teo +4

Photons are a ubiquitous carrier of quantum information: they are fast, suffer minimal decoherence, and do not require huge cryogenic facilities. Nevertheless, their intrinsically…

quant-ph2025

Cavity-based optical switching via phase modulation in warm rubidium vapor

Georgia Booton, Tabijah Wasawo, William O. C. Davis +5

Optical switching remains a key outstanding challenge for scalable fault-tolerant photonic quantum computing due to the trade-off between speed, bandwidth, and loss. Scalable quant…

quant-ph2025

Theory of Three-Photon Transport Through a Weakly Coupled Atomic Ensemble

Yangming Wang, Noe Demazure, Sahand Mahmoodian

Understanding multi-photon interactions in non-equilibrium quantum systems is an outstanding challenge in quantum optics. In this work, we develop an analytical and diagrammatic fr…

quant-ph2025★ 3 cited

Engineering continuous-variable entanglement in mechanical oscillators with optimal control

Maverick J. Millican, Vassili G. Matsos, Christophe H. Valahu +3

We demonstrate an optimal quantum control strategy for the deterministic preparation of entangled harmonic oscillator states in trapped ions. The protocol employs dynamical phase m…

quant-ph2025★ 2 cited

Characterizing physical and logical errors in a transversal CNOT via cycle error reconstruction

Nicholas Fazio, Robert Freund, Debankan Sannamoth +7

The development of prototype quantum information processors has progressed to a stage where small instances of logical qubit systems perform better than the best of their physical…

quant-ph2025

Universal fault tolerant quantum computation in 2D without getting tied in knots

Margarita Davydova, Andreas Bauer, Julio C. Magdalena de la Fuente +3

We show how to perform scalable fault-tolerant non-Clifford gates in two dimensions by introducing domain walls between the surface code and a non-Abelian topological code whose co…

quant-ph2025★ 1 cited

Protected phase gate for the - qubit using its internal modes

Xanda C Kolesnikow, Thomas B Smith, Felix Thomsen +2

Protected superconducting qubits such as the - qubit promise to substantially reduce physical error rates. However, a key challenge in the field is designing gates for these…

quant-ph2025

Near-deterministic photon entanglement from a spin qudit in silicon using third quantisation

Gözde Üstün, Samuel Elman, Jarryd J. Pla +3

Unlike other quantum hardware, photonic quantum architectures can produce millions of qubits from a single device. However, controlling photonic qubits remains challenging, even at…

quant-ph2024

Experimental quantum randomness enhanced by a quantum network

Emanuele Polino, Luis Villegas-Aguilar, Davide Poderini +10

The certification of randomness is essential for both fundamental science and information technologies. Unlike traditional random number generators, randomness obtained from nonloc…

quant-ph2024★ 2 cited

Generation of Tunable Three-Photon Entanglement in Cubic Nonlinear Coupled Waveguides

Miguel Bacaoco, Max Galettis, James Huang +2

We theoretically investigate the generation of three-photon states with spatial entanglement in cubic nonlinear coupled waveguides using third-order spontaneous parametric down-con…

quant-ph2024★ 2 cited

Efficient optical cat state generation using squeezed few-photon superposition states

Haoyuan Luo, Sahand Mahmoodian

Optical Schrödinger cat states are non-Gaussian states with applications in quantum technologies, such as for building error-correcting states in quantum computing. Yet the efficie…

quant-ph2024★ 1 cited

How contextuality and antidistinguishability are related

Maiyuren Srikumar, Stephen D. Bartlett, Angela Karanjai

Contextuality is a key characteristic that separates quantum from classical phenomena and an important tool in understanding the potential advantage of quantum computation. However…

quant-ph2024★ 1 cited

Topological stabilizer models on continuous variables

Julio C. Magdalena de la Fuente, Tyler D. Ellison, Meng Cheng +1

We construct a family of two-dimensional topological stabilizer codes on continuous variable (CV) degrees of freedom, which generalize homological rotor codes and the toric-GKP cod…

quant-ph2024★ 8 cited

Efficient Preparation of Solvable Anyons with Adaptive Quantum Circuits

Yuanjie Ren, Nathanan Tantivasadakarn, Dominic J. Williamson

The classification of topological phases of matter is a fundamental challenge in quantum many-body physics, with applications to quantum technology. Recently, this classification h…

quant-ph2024

Wire Codes

Nouédyn Baspin, Dominic Williamson

Quantum information is fragile and must be protected by a quantum error-correcting code for large-scale practical applications. Recently, highly efficient quantum codes have been d…

quant-ph2024★ 3 cited

Thresholds for post-selected quantum error correction from statistical mechanics

Lucas H. English, Dominic J. Williamson, Stephen D. Bartlett

We identify regimes where post-selection can be used scalably in quantum error correction (QEC) to improve performance. We use statistical mechanical models to analytically quantif…

quant-ph2024★ 8 cited

Low-overhead magic state distillation with color codes

Seok-Hyung Lee, Felix Thomsen, Nicholas Fazio +2

Fault-tolerant implementation of non-Clifford gates is a major challenge for achieving universal fault-tolerant quantum computing with quantum error-correcting codes. Magic state d…

quant-ph2024★ 22 cited

Experimental Quantum Simulation of Chemical Dynamics

T. Navickas, R. J. MacDonell, C. H. Valahu +10

Accurate simulation of dynamical processes in molecules and reactions is among the most challenging problems in quantum chemistry. Quantum computers promise efficient chemical simu…

quant-ph2024★ 2 cited

On the energy barrier of hypergraph product codes

Guangqi Zhao, Andrew C. Doherty, Isaac H. Kim

A macroscopic energy barrier is a necessary condition for self-correcting quantum memory. In this paper, we prove tight bounds on the energy barrier applicable to any quantum code…