Quantum

Paper

Towards local testability for quantum coding

Anthony Leverrier, Vivien Londe, and Gilles Zémor,

Quantum 6, 661 (2022).

We introduce the hemicubic codes, a family of quantum codes obtained by associating qubits with the $p$-faces of the $n$-cube (for $n \gt p$) and stabilizer constraints with faces of dimension…

Paper

Direct detection of quantum non-Gaussian light from a dispersively coupled single atom

Jitendra K. Verma, Lukáš Lachman, and Radim Filip,

Quantum 6, 660 (2022).

Many applications in quantum communication, sensing and computation need provably quantum non-Gaussian light. Recently such light, witnessed by a negative Wigner function, has been estimated…

Paper

A quantum prediction as a collection of epistemically restricted classical predictions

William F. Braasch Jr. and William K. Wootters,

Quantum 6, 659 (2022).

Spekkens has introduced an $\textit{epistemically restricted classical theory}$ of discrete systems, based on discrete phase space. The theory manifests a number of quantum-like properties but…

Paper

Online identification of symmetric pure states

Gael Sentís, Esteban Martínez-Vargas, and Ramon Muñoz-Tapia,

Quantum 6, 658 (2022).

We consider online strategies for discriminating between symmetric pure states with zero error when $n$ copies of the states are provided. Optimized online strategies involve local, possibly a…

Paper

Matchgate benchmarking: Scalable benchmarking of a continuous family of many-qubit gates

Jonas Helsen, Sepehr Nezami, Matthew Reagor, and Michael Walter,

Quantum 6, 657 (2022).

We propose a method to reliably and efficiently extract the fidelity of many-qubit quantum circuits composed of continuously parametrized two-qubit gates called matchgates. This method, whic…

Paper

Maximal violation of steering inequalities and the matrix cube

Andreas Bluhm and Ion Nechita,

Quantum 6, 656 (2022).

In this work, we characterize the amount of steerability present in quantum theory by connecting the maximal violation of a steering inequality to an inclusion problem of free spectrahedra.…

Paper

The refined quantum extremal surface prescription from the asymptotic equipartition property

Jinzhao Wang,

Quantum 6, 655 (2022).

Information-theoretic ideas have provided numerous insights in the progress of fundamental physics, especially in our pursuit of quantum gravity. In particular, the holographic entanglement…

Paper

Hierarchy of correlation quantifiers comparable to negativity

Ray Ganardi, Marek Miller, Tomasz Paterek, and Marek Żukowski,

Quantum 6, 654 (2022).

Quantum systems generally exhibit different kinds of correlations. In order to compare them on equal footing, one uses the so-called distance-based approach where different types of correlat…

Paper

Building Multiple Access Channels with a Single Particle

Yujie Zhang, Xinan Chen, and Eric Chitambar,

Quantum 6, 653 (2022).

A multiple access channel describes a situation in which multiple senders are trying to forward messages to a single receiver using some physical medium. In this paper we consider scenarios…

Paper

Lower Bounds on Stabilizer Rank

Shir Peleg, Amir Shpilka, and Ben Lee Volk,

Quantum 6, 652 (2022).

The $\textit{stabilizer rank}$ of a quantum state $\psi$ is the minimal $r$ such that $\left| \psi \right \rangle = \sum_{j=1}^r c_j \left|\varphi_j \right\rangle$ for $c_j \in \mathbb{C}$ and stabili…

Paper

Entanglement of Local Hidden States

Matteo Fadel and Manuel Gessner,

Quantum 6, 651 (2022).

Steering criteria are conditions whose violation excludes the possibility of describing the observed measurement statistics with local hidden state (LHS) models. When the available data do n…

Paper

Exponential decay of mutual information for Gibbs states of local Hamiltonians

Andreas Bluhm, Ángela Capel, and Antonio Pérez-Hernández,

Quantum 6, 650 (2022).

The thermal equilibrium properties of physical systems can be described using Gibbs states. It is therefore of great interest to know when such states allow for an easy description. In parti…

Paper

Arnoldi-Lindblad time evolution: Faster-than-the-clock algorithm for the spectrum of time-independent and Floquet open quantum systems

Fabrizio Minganti and Dolf Huybrechts,

Quantum 6, 649 (2022).

The characterization of open quantum systems is a central and recurring problem for the development of quantum technologies. For time-independent systems, an (often unique) steady state desc…

Paper

Gottesman-Kitaev-Preskill codes: A lattice perspective

Jonathan Conrad, Jens Eisert, and Francesco Arzani,

Quantum 6, 648 (2022).

We examine general Gottesman-Kitaev-Preskill (GKP) codes for continuous-variable quantum error correction, including concatenated GKP codes, through the lens of lattice theory, in order to b…

Paper

Bounding the quantum capacity with flagged extensions

Farzad Kianvash, Marco Fanizza, and Vittorio Giovannetti,

Quantum 6, 647 (2022).

In this article we consider flagged extensions of convex combination of quantum channels, and find general sufficient conditions for the degradability of the flagged extension. An immediate…

Paper

Resolution of Quantum Imaging with Undetected Photons

Jorge Fuenzalida, Armin Hochrainer, Gabriela Barreto Lemos, Evelyn A. Ortega, Radek Lapkiewicz, Mayukh Lahiri, and Anton Zeilinger,

Quantum 6, 646 (2022).

Quantum imaging with undetected photons is a recently introduced technique that goes significantly beyond what was previously possible. In this technique, images are formed without detecting…

Category: Paper