Quantum

Paper

Self-organized topological insulator due to cavity-mediated correlated tunneling

Titas Chanda, Rebecca Kraus, Giovanna Morigi, and Jakub Zakrzewski,

Quantum 5, 501 (2021).

Topological materials have potential applications for quantum technologies. Non-interacting topological materials, such as e.g., topological insulators and superconductors, are classified by…

Paper

Charging a quantum battery with linear feedback control

Mark T. Mitchison, John Goold, and Javier Prior,

Quantum 5, 500 (2021).

Energy storage is a basic physical process with many applications. When considering this task at the quantum scale, it becomes important to optimise the non-equilibrium dynamics of energy tr…

Paper

Single-copy activation of Bell nonlocality via broadcasting of quantum states

Joseph Bowles, Flavien Hirsch, and Daniel Cavalcanti,

Quantum 5, 499 (2021).

Activation of Bell nonlocality refers to the phenomenon that some entangled mixed states that admit a local hidden variable model in the standard Bell scenario nevertheless reveal their nonl…

Paper

Quantum erasing the memory of Wigner’s friend

Cyril Elouard, Philippe Lewalle, Sreenath K. Manikandan, Spencer Rogers, Adam Frank, and Andrew N. Jordan,

Quantum 5, 498 (2021).

The Wigner's friend paradox concerns one of the most puzzling problems of quantum mechanics: the consistent description of multiple nested observers. Recently, a variation of Wigner's gedank…

Paper

Stim: a fast stabilizer circuit simulator

Craig Gidney,

Quantum 5, 497 (2021).

This paper presents “Stim", a fast simulator for quantum stabilizer circuits. The paper explains how Stim works and compares it to existing tools. With no foreknowledge, Stim can analyze a d…

Paper

Quantum machine learning with adaptive linear optics

Ulysse Chabaud, Damian Markham, and Adel Sohbi,

Quantum 5, 496 (2021).

We study supervised learning algorithms in which a quantum device is used to perform a computational subroutine – either for prediction via probability estimation, or to compute a kernel via…

Paper

Nearly tight Trotterization of interacting electrons

Yuan Su, Hsin-Yuan Huang, and Earl T. Campbell,

Quantum 5, 495 (2021).

We consider simulating quantum systems on digital quantum computers. We show that the performance of quantum simulation can be improved by simultaneously exploiting commutativity of the targ…

Paper

Stationary Phase Method in Discrete Wigner Functions and Classical Simulation of Quantum Circuits

Lucas Kocia and Peter Love,

Quantum 5, 494 (2021).

One of the lowest-order corrections to Gaussian quantum mechanics in infinite-dimensional Hilbert spaces are Airy functions: a uniformization of the stationary phase method applied in the pa…

Paper

Real-time ghost imaging of Bell-nonlocal entanglement between a photon and a quantum memory

Mateusz Mazelanik, Adam Leszczyński, Michał Lipka, Wojciech Wasilewski, and Michał Parniak,

Quantum 5, 493 (2021).

Certification of nonlocality of quantum mechanics is an important fundamental test that typically requires prolonged data collection and is only revealed in an in-depth analysis. These featu…

Paper

Algorithmic Error Mitigation Scheme for Current Quantum Processors

Philippe Suchsland, Francesco Tacchino, Mark H. Fischer, Titus Neupert, Panagiotis Kl. Barkoutsos, and Ivano Tavernelli,

Quantum 5, 492 (2021).

We present a hardware agnostic error mitigation algorithm for near term quantum processors inspired by the classical Lanczos method. This technique can reduce the impact of different sources…

Paper

Quantum annealing initialization of the quantum approximate optimization algorithm

Stefan H. Sack and Maksym Serbyn,

Quantum 5, 491 (2021).

The quantum approximate optimization algorithm (QAOA) is a prospective near-term quantum algorithm due to its modest circuit depth and promising benchmarks. However, an external parameter op…

Paper

Entanglement-Free Parameter Estimation of Generalized Pauli Channels

Junaid ur Rehman and Hyundong Shin,

Quantum 5, 490 (2021).

We propose a parameter estimation protocol for generalized Pauli channels acting on $d$-dimensional Hilbert space. The salient features of the proposed method include product probe states and…

Paper

Adiabatic critical quantum metrology cannot reach the Heisenberg limit even when shortcuts to adiabaticity are applied

Karol Gietka, Friederike Metz, Tim Keller, and Jing Li,

Quantum 5, 489 (2021).

We show that the quantum Fisher information attained in an adiabatic approach to critical quantum metrology cannot lead to the Heisenberg limit of precision and therefore $regular$ quantum met…

Paper

Programmability of covariant quantum channels

Martina Gschwendtner, Andreas Bluhm, and Andreas Winter,

Quantum 5, 488 (2021).

A programmable quantum processor uses the states of a program register to specify one element of a set of quantum channels which is applied to an input register. It is well-known that such a…

Paper

Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions

Pedro Parrado-Rodríguez, Ciarán Ryan-Anderson, Alejandro Bermudez, and Markus Müller,

Quantum 5, 487 (2021).

Physical qubits in experimental quantum information processors are inevitably exposed to different sources of noise and imperfections, which lead to errors that typically accumulate hinderin…

Paper

Probing the edge between integrability and quantum chaos in interacting few-atom systems

Thomás Fogarty, Miguel Ángel García-March, Lea F. Santos, and Nathan L. Harshman,

Quantum 5, 486 (2021).

Interacting quantum systems in the chaotic domain are at the core of various ongoing studies of many-body physics, ranging from the scrambling of quantum information to the onset of thermali…

Category: Paper