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quant-ph2026★ 1 cited

Decoherence in Waveguide Quantum Electrodynamics using Matrix Product States

Matias Bundgaard-Nielsen, Matthew Kozma, Sofia Arranz Regidor +1

We present a matrix product state (MPS) method for including decoherence processes in calculations involving waveguide quantum electrodynamics (waveguide QED) using density matrice…

quant-ph2026

Beyond the Quantum Regression Theorem in Variational Polaron Master Equations: from Ohmic to Super-Ohmic Environments

Matias Bundgaard-Nielsen, Jake Iles-Smith

While the quantum regression theorem (QRT) is the standard tool for computing multi-time correlation functions in open quantum systems, it relies on system-bath separability and an…

quant-ph2026

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…

quant-ph2026★ 4 cited

An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security

Maron F Anka, John A. Mora Rodríguez, Douglas F. Pinto +3

Continuous-variable quantum key distribution (CV-QKD) has emerged as a promising approach for secure quantum communication, offering advantages such as high key generation rates, c…

quant-ph2026

On-chip semi-device-independent quantum random number generator exploiting contextuality

Maddalena Genzini, Caterina Vigliar, Mujtaba Zahidy +6

We present a semi-device-independent quantum random number generator (QRNG) based on the violation of a contextuality inequality, implemented by the integration of two silicon phot…

quant-ph2025

Cost-effective scalable quantum error mitigation for tiled Ansätze

Oskar Graulund Lentz Rasmussen, Erik Kjellgren, Peter Reinholdt +4

We introduce a cost-effective quantum error mitigation technique that builds upon the recent Ansatz-based gate and readout error mitigation method (M0). The technique, tiled M0, le…

quant-ph2025

Modeling Quantum Noise in Nanolasers using Markov Chains

Matias Bundgaard-Nielsen, Gian Luca Lippi, Jesper Mørk

The random nature of spontaneous emission leads to unavoidable fluctuations in a laser's output. This is often included through random Langevin forces in laser rate equations, but…

quant-ph2025★ 1 cited

Semi-device-independent randomness certification on discretized continuous-variable platforms

Moisés Alves, Vitor L. Sena, Santiago Zamora +4

Randomness is fundamental for secure communication and information processing. While continuous-variable optical systems offer an attractive platform for this task, certifying genu…

quant-ph2025

Sequential Semi-Device-Independent Quantum Randomness Certification

Carles Roch I Carceller, Hanwool Lee, Jonatan Bohr Brask +2

Quantum measurements under realistic conditions reveal only partial information about a system. Yet, by performing sequential measurements on the same system, additional informatio…

quant-ph2025

Comparison and optimisation of hybridization algorithms for onboard classical and quantum accelerometers

Benoit Kaczmarczuk, Yannick Bidel, Alexandre Bresson +6

We study two hybridization algorithms used for the combination of a quantum inertial sensor based on atom interferometry with a classical inertial sensor for onboard acceleration m…

quant-ph2025

Privacy in continuous-variable distributed quantum sensing

A. de Oliveira Junior, Anton L. Andersen, Benjamin Lundgren Larsen +5

Can a distributed network of quantum sensors estimate a global parameter while protecting every locally encoded value? We answer this question affirmatively by introducing and anal…

quant-ph2025★ 1 cited

Long-distance device-independent quantum key distribution with standard optics tools

Makoto Ishihara, Anthony Brendan, Wojciech Roga +2

Device-independent quantum key distribution (DI-QKD) enables information-theoretically secure key exchange between remote parties without any assumptions on the internal workings o…

quant-ph2025★ 1 cited

General Approach to Error Detection of Bosonic Codes via Phase Estimation

Yuan-De Jin, Shi-Yu Zhang, Ulrik L. Andersen +1

We present a general approach to error detection of bosonic quantum error-correction codes via an adaptive quantum phase estimation algorithm assisted by a single ancilla qubit. Th…

quant-ph2025

Extended Kalman Smoothing of Free Spin Precession Signals for Accurate Magnetic Field Determination

Jasper Riebesehl, Lutz Mertenskötter, Wiebke Pohlandt +2

We present a novel application of the Extended Kalman Smoother (EKS) for highly accurate frequency estimation from free spin precession signals of polarized He. Traditional app…

quant-ph2025

Long-Distance Device-Independent Conference Key Agreement

Makoto Ishihara, Anders J. E. Bjerrum, Wojciech Roga +3

Device-independent quantum key distribution (DI-QKD) enables two remote parties to share an information-theoretically secure key without any assumptions on the inner workings of th…

quant-ph2025

Practical continuous-variable quantum key distribution with squeezed light

Huy Q. Nguyen, Ivan Derkach, Akash nag Oruganti +6

Continuous-variable quantum key distribution (CV-QKD) has gathered significant interest for its potential to achieve high secret key rates and seamless integration with existing op…

quant-ph2025★ 15 cited

A Perspective on Quantum Computing Applications in Quantum Chemistry using 25--100 Logical Qubits

Yuri Alexeev, Victor S. Batista, Nicholas Bauman +27

The intersection of quantum computing and quantum chemistry represents a promising frontier for achieving quantum utility in domains of both scientific and societal relevance. Owin…

quant-ph2025

Squeezing light with optomechanical and spin-light quantum interfaces

Gian-Luca Schmid, Manel Bosch Aguilera, Chun Tat Ngai +6

We investigate squeezing of light through quantum-noise-limited interactions with two different material systems: an ultracold atomic spin ensemble and a micromechanical membrane.…

quant-ph2025★ 1 cited

Benchmarks for quantum communication via gravity

Kristian Toccacelo, Ulrik Lund Andersen, Jonatan Bohr Brask

We establish limitations and bounds on the transmission of quantum states between gravitationally interacting mechanical oscillators under different models of gravity. This provide…

quant-ph2025★ 1 cited

Hyperfine Coupling Constants on Quantum Computers: Performance, Errors, and Future Prospects

Phillip W. K. Jensen, Gustav Stausbøll Hedemark, Karl Michael Ziems +6

We present the first implementation and computation of electron spin resonance isotropic hyperfine coupling constants (HFCs) on quantum hardware. As illustrative test cases, we com…

quant-ph2025★ 8 cited

Quantum learning advantage on a scalable photonic platform

Zheng-Hao Liu, Romain Brunel, Emil E. B. Østergaard +12

Recent advancements in quantum technologies have opened new horizons for exploring the physical world in ways once deemed impossible. Central to these breakthroughs is the concept…

quant-ph2025★ 10 cited

Quantum State Tomography in a Third-Order Integrated Optical Parametric Oscillator

Roger Alfredo Kögler, Gabriel Couto Rickli, Renato Ribeiro Domeneguetti +5

We measured the covariance matrix of the fields generated in an integrated third-order optical parametric oscillator operating above threshold. We observed up to dB…

quant-ph2025

Two-particle quantum interference in a nonlinear optical medium: a witness of timelike indistinguishability

Chao Chen, Shu-Tian Xue, Yu-Peng Shi +8

The Hong-Ou-Mandel effect is a paradigmatic quantum phenomenon demonstrating the interference of two indistinguishable photons that are linearly coupled at a 50:50 beam splitter. H…

quant-ph2025★ 15 cited

Coexistence of continuous-variable quantum key distribution and classical data over 120-km fiber

Adnan A. E. Hajomer, Ivan Derkach, Vladyslav C. Usenko +2

Integrating quantum key distribution (QKD) with classical data transmission over the same fiber is crucial for scalable quantum-secured communication. However, noise from classical…