Quantum

Paper

(Almost-)Quantum Bell Inequalities and Device-Independent Applications

Yuan Liu, Ho Yiu Chung, and Ravishankar Ramanathan,

Quantum 8, 1489 (2024).

Investigations of the boundary of the quantum correlation set have gained increased attention in recent years. This is done through the derivation of quantum Bell inequalities, which are rel…

Paper

Topological photon pumping in quantum optical systems

Mathias B. M. Svendsen, Marcel Cech, Max Schemmer, and Beatriz Olmos,

Quantum 8, 1488 (2024).

We establish the concept of topological pumping in one-dimensional systems with long-range couplings and apply it to the transport of a photon in quantum optical systems. In our theoretical…

Paper

Quantum Multiple Eigenvalue Gaussian filtered Search: an efficient and versatile quantum phase estimation method

Zhiyan Ding, Haoya Li, Lin Lin, HongKang Ni, Lexing Ying, and Ruizhe Zhang,

Quantum 8, 1487 (2024).

Quantum phase estimation is one of the most powerful quantum primitives. This work proposes a new approach for the problem of multiple eigenvalue estimation: Quantum Multiple Eigenvalue Gaus…

Paper

Stochastic Thermodynamics at the Quantum-Classical Boundary: A Self-Consistent Framework Based on Adiabatic-Response Theory

Joshua Eglinton, Federico Carollo, Igor Lesanovsky, and Kay Brandner,

Quantum 8, 1486 (2024).

Microscopic thermal machines promise to play an important role in future quantum technologies. Making such devices widely applicable will require effective strategies to channel their output…

Paper

Relating Wigner’s Friend Scenarios to Nonclassical Causal Compatibility, Monogamy Relations, and Fine Tuning

Yìlè Yīng, Marina Maciel Ansanelli, Andrea Di Biagio, Elie Wolfe, David Schmid, and Eric Gama Cavalcanti,

Quantum 8, 1485 (2024).

Nonclassical causal modeling was developed in order to explain violations of Bell inequalities while adhering to relativistic causal structure and $faithfulness$—that is, avoiding fine-tuned…

Paper

Tight and Efficient Gradient Bounds for Parameterized Quantum Circuits

Alistair Letcher, Stefan Woerner, and Christa Zoufal,

Quantum 8, 1484 (2024).

The training of a parameterized model largely depends on the landscape of the underlying loss function. In particular, vanishing gradients are a central bottleneck in the scalability of vari…

Paper

Optimal light cone for macroscopic particle transport in long-range systems: A quantum speed limit approach

Tan Van Vu, Tomotaka Kuwahara, and Keiji Saito,

Quantum 8, 1483 (2024).

Understanding the ultimate rate at which information propagates is a pivotal issue in nonequilibrium physics. Nevertheless, the task of elucidating the propagation speed inherent in quantum…

Paper

Mitigating controller noise in quantum gates using optimal control theory

Aviv Aroch, Ronnie Kosloff, and Shimshon Kallush,

Quantum 8, 1482 (2024).

All quantum systems are subject to noise from the environment or external controls. This noise is a major obstacle to the realization of quantum technology. For example, noise limits the fid…

Paper

Wigner’s friend’s memory and the no-signaling principle

Veronika Baumann and Časlav Brukner,

Quantum 8, 1481 (2024).

The Wigner's friend experiment is a thought experiment in which a so-called superobserver (Wigner) observes another observer (the friend) who has performed a quantum measurement on a physica…

Paper

Adaptive Phase Estimation with Squeezed Vacuum Approaching the Quantum Limit

M. A. Rodríguez-García and F. E. Becerra,

Quantum 8, 1480 (2024).

Phase estimation plays a central role in communications, sensing, and information processing. Quantum correlated states, such as squeezed states, enable phase estimation beyond the shot-nois…

Paper

Efficient validation of Boson Sampling from binned photon-number distributions

Benoit Seron, Leonardo Novo, Alex Arkhipov, and Nicolas J. Cerf,

Quantum 8, 1479 (2024).

In order to substantiate claims of quantum computational advantage, it is crucial to develop efficient methods for validating the experimental data. We propose a test of the correct function…

Paper

Safeguarding Oscillators and Qudits with Distributed Two-Mode Squeezing

Anthony J. Brady, Jing Wu, and Quntao Zhuang,

Quantum 8, 1478 (2024).

Recent advancements in multi-mode Gottesman-Kitaev-Preskill (GKP) codes have shown great promise in enhancing the protection of both discrete and analog quantum information. This broadened r…

Paper

Sampling Error Analysis in Quantum Krylov Subspace Diagonalization

Gwonhak Lee, Dongkeun Lee, and Joonsuk Huh,

Quantum 8, 1477 (2024).

Quantum Krylov subspace diagonalization (QKSD) is an emerging method used in place of quantum phase estimation in the early fault-tolerant era, where limited quantum circuit depth is availab…

Paper

Efficient entanglement purification based on noise guessing decoding

André Roque, Diogo Cruz, Francisco A. Monteiro, and Bruno C. Coutinho,

Quantum 8, 1476 (2024).

In this paper, we propose a novel bipartite entanglement purification protocol built upon hashing and upon the guessing random additive noise decoding (GRAND) approach recently devised for c…

Paper

Tensor-network-based variational Monte Carlo approach to the non-equilibrium steady state of open quantum systems

Dawid A. Hryniuk and Marzena H. Szymańska,

Quantum 8, 1475 (2024).

We introduce a novel method of efficiently simulating the non-equilibrium steady state of large many-body open quantum systems with highly non-local interactions, based on a variational Mont…

Paper

End-to-end complexity for simulating the Schwinger model on quantum computers

Kazuki Sakamoto, Hayata Morisaki, Junichi Haruna, Etsuko Itou, Keisuke Fujii, and Kosuke Mitarai,

Quantum 8, 1474 (2024).

The Schwinger model is one of the simplest gauge theories. It is known that a topological term of the model leads to the infamous sign problem in the classical Monte Carlo method. In contras…

Category: Paper