Quantum

Quantum has published 151 Papers in 3 Volumes, as well as 14 Views in Quantum Views.

DOAJ Seal certifies Quantum’s high publishing standards

Quantum has been awarded the DOAJ Seal. The seal is a distinction for journals that achieve a particularly high level of compliance to best practices and publishing standards. We are …

Perspective

Breaking barriers: photon-blockade breakdown from the few quanta to the thermodynamic limit

Ricardo Gutiérrez-Jáuregui,

Quantum Views 3, 14 (2019).

Photon blockade has become an iconic example of quantum optics in the strong coupling regime, where coherent dynamics dominate over dissipation, and properties that we have come to associate…

Paper

Generalized Adiabatic Theorem and Strong-Coupling Limits

Daniel Burgarth, Paolo Facchi, Hiromichi Nakazato, Saverio Pascazio, and Kazuya Yuasa,

Quantum 3, 152 (2019).

We generalize Kato's adiabatic theorem to nonunitary dynamics with an isospectral generator. This enables us to unify two strong-coupling limits: one driven by fast oscillations under a Hami…

Paper

Asymptotics of quantum channels: conserved quantities, an adiabatic limit, and matrix product states

Victor V. Albert,

Quantum 3, 151 (2019).

This work derives an analytical formula for the asymptotic state—the quantum state resulting from an infinite number of applications of a general quantum channel on some initial state. For…

Paper

Finite-size scaling of the photon-blockade breakdown dissipative quantum phase transition

A. Vukics, A. Dombi, J. M. Fink, and P. Domokos,

Quantum 3, 150 (2019).

We prove that the observable telegraph signal accompanying the bistability in the photon-blockade-breakdown regime of the driven and lossy Jaynes–Cummings model is the finite-size precursor…

Paper

A Quantum N-Queens Solver

Valentin Torggler, Philipp Aumann, Helmut Ritsch, and Wolfgang Lechner,

Quantum 3, 149 (2019).

The $N$-queens problem is to find the position of $N$ queens on an $N$ by $N$ chess board such that no queens attack each other. The excluded diagonals $N$-queens problem is a variation wher…

Paper

On the properties of spectral effect algebras

Anna Jenčová and Martin Plávala,

Quantum 3, 148 (2019).

The aim of this paper is to show that there can be either only one or uncountably many contexts in any spectral effect algebra, answering a question posed in [S. Gudder, Convex and Sequentia…

Paper

Emergence of Network Bifurcation Triggered by Entanglement

Xi Yong, Man-Hong Yung, Xue-Ke Song, Xun Gao, and Angsheng Li,

Quantum 3, 147 (2019).

In many non-linear systems, such as plasma oscillation, boson condensation, chemical reaction, and even predatory-prey oscillation, the coarse-grained dynamics are governed by an equation co…

Paper

Graphical Methods in Device-Independent Quantum Cryptography

Spencer Breiner, Carl A. Miller, and Neil J. Ross,

Quantum 3, 146 (2019).

We introduce a framework for graphical security proofs in device-independent quantum cryptography using the methods of categorical quantum mechanics. We are optimistic that this approach wil…

Paper

The Short Path Algorithm Applied to a Toy Model

M. B. Hastings,

Quantum 3, 145 (2019).

We numerically investigate the performance of the short path optimization algorithm on a toy problem, with the potential chosen to depend only on the total Hamming weight to allow simulation…

Paper

Divisibility of qubit channels and dynamical maps

David Davalos, Mario Ziman, and Carlos Pineda,

Quantum 3, 144 (2019).

The concept of divisibility of dynamical maps is used to introduce an analogous concept for quantum channels by analyzing the $\textit{simulability}$ of channels by means of dynamical maps.…

Paper

Fault-tolerant magic state preparation with flag qubits

Christopher Chamberland and Andrew W. Cross,

Quantum 3, 143 (2019).

Magic state distillation is one of the leading candidates for implementing universal fault-tolerant logical gates. However, the distillation circuits themselves are not fault-tolerant, so th…

Paper

Subsystem symmetries, quantum cellular automata, and computational phases of quantum matter

David T. Stephen, Hendrik Poulsen Nautrup, Juani Bermejo-Vega, Jens Eisert, and Robert Raussendorf,

Quantum 3, 142 (2019).

Quantum phases of matter are resources for notions of quantum computation. In this work, we establish a new link between concepts of quantum information theory and condensed matter physics b…

Paper

Multiplexed Quantum Random Number Generation

Ben Haylock, Daniel Peace, Francesco Lenzini, Christian Weedbrook, and Mirko Lobino,

Quantum 3, 141 (2019).

Fast secure random number generation is essential for high-speed encrypted communication, and is the backbone of information security. Generation of truly random numbers depends on the intri…

Paper

Quantum-assisted quantum compiling

Sumeet Khatri, Ryan LaRose, Alexander Poremba, Lukasz Cincio, Andrew T. Sornborger, and Patrick J. Coles,

Quantum 3, 140 (2019).

Compiling quantum algorithms for near-term quantum computers (accounting for connectivity and native gate alphabets) is a major challenge that has received significant attention both by indu…

Paper

Two-local qubit Hamiltonians: when are they stoquastic?

Joel Klassen and Barbara M. Terhal,

Quantum 3, 139 (2019).

We examine the problem of determining if a 2-local Hamiltonian is stoquastic by local basis changes. We analyze this problem for two-qubit Hamiltonians, presenting some basic tools and givin…