Quantum

Quantum has published 908 Papers in 7 Volumes, as well as 71 Views in Quantum Views.

Call for editors 2023

In 2023 Quantum will celebrate 6 years since the first publications! From that first batch of papers, the journal grew to nearly 900 published articles. This growth was made possible by …

Perspective

Universality in quantum snapshots

Pieter W. Claeys,

Quantum Views 7, 71 (2023).

Thermalization and random matrices One of the main challenges in quantum mechanics lies in understanding the dynamical behaviour of many-body systems. How do isolated quantum systems relax t…

Perspective

Extending Quantum topological data analysis to persistent homology

Sam McArdle,

Quantum Views 7, 70 (2023).

It is an open challenge to design quantum algorithms for machine learning that do not need access to large amounts of data – the efficient loading of which would require challenging-t…

Paper

Variational quantum algorithm for unconstrained black box binary optimization: Application to feature selection

Christa Zoufal, Ryan V. Mishmash, Nitin Sharma, Niraj Kumar, Aashish Sheshadri, Amol Deshmukh, Noelle Ibrahim, Julien Gacon, and Stefan Woerner,

Quantum 7, 909 (2023).

We introduce a variational quantum algorithm to solve unconstrained black box binary optimization problems, i.e., problems in which the objective function is given as black box. This is in c…

Paper

Pulse based Variational Quantum Optimal Control for hybrid quantum computing

Robert de Keijzer, Oliver Tse, and Servaas Kokkelmans,

Quantum 7, 908 (2023).

This work studies pulse based variational quantum algorithms (VQAs), which are designed to determine the ground state of a quantum mechanical system by combining classical and quantum hardwa…

Paper

Persistent nonlocality in an ultracold-atom environment

Bradley Longstaff and Jonatan Bohr Brask,

Quantum 7, 907 (2023).

We investigate nonlocal quantum correlations arising between multiple two-level impurity atoms coupled to an ultracold bosonic gas. We find that the environment-induced dynamics of the impur…

Paper

Adaptive estimation of quantum observables

Ariel Shlosberg, Andrew J. Jena, Priyanka Mukhopadhyay, Jan F. Haase, Felix Leditzky, and Luca Dellantonio,

Quantum 7, 906 (2023).

The accurate estimation of quantum observables is a critical task in science. With progress on the hardware, measuring a quantum system will become increasingly demanding, particularly for v…

Paper

High-accuracy Hamiltonian learning via delocalized quantum state evolutions

Davide Rattacaso, Gianluca Passarelli, and Procolo Lucignano,

Quantum 7, 905 (2023).

Learning the unknown Hamiltonian governing the dynamics of a quantum many-body system is a challenging task. In this manuscript, we propose a possible strategy based on repeated measurements…

Paper

Remotely Controlled Entanglement Generation

Ferran Riera-Sàbat, Pavel Sekatski, and Wolfgang Dür,

Quantum 7, 904 (2023).

We consider a system of multiple qubits without any quantum control. We show that one can mediate entanglement between different subsystems in a controlled way by adding a (locally) controll…

Paper

Generation of highly retrievable atom photon entanglement with a millisecond lifetime via a spatially multiplexed cavity

Minjie Wang, Shengzhi Wang, Tengfei Ma, Ya Li, Yan Xie, Haole Jiao, Hailong Liu, Shujing Li, and Hai Wang,

Quantum 7, 903 (2023).

Qubit memory that is entangled with photonic qubit is the building block for long distance quantum repeaters. Cavity enhanced and long lived spin wave photon entanglement has been demonstrat…

Paper

Resonant Multilevel Amplitude Damping Channels

Stefano Chessa and Vittorio Giovannetti,

Quantum 7, 902 (2023).

We introduce a new set of quantum channels: resonant multilevel amplitude damping (ReMAD) channels. Among other instances, they can describe energy dissipation effects in multilevel atomic s…

Paper

Quantum Tokens for Digital Signatures

Shalev Ben-David and Or Sattath,

Quantum 7, 901 (2023).

The fisherman caught a quantum fish. "Fisherman, please let me go", begged the fish, "and I will grant you three wishes". The fisherman agreed. The fish gave the fisherman a quantum computer…

Paper

Contextuality in composite systems: the role of entanglement in the Kochen-Specker theorem

Victoria J Wright and Ravi Kunjwal,

Quantum 7, 900 (2023).

The Kochen–Specker (KS) theorem reveals the nonclassicality of single quantum systems. In contrast, Bell's theorem and entanglement concern the nonclassicality of composite quantum systems.…

Paper

Symmetry enhanced variational quantum spin eigensolver

Chufan Lyu, Xusheng Xu, Man-Hong Yung, and Abolfazl Bayat,

Quantum 7, 899 (2023).

The variational quantum-classical algorithms are the most promising approach for achieving quantum advantage on near-term quantum simulators. Among these methods, the variational quantum eig…

Paper

Multipartite Intrinsic Non-Locality and Device-Independent Conference Key Agreement

Aby Philip, Eneet Kaur, Peter Bierhorst, and Mark M. Wilde,

Quantum 7, 898 (2023).

In this work, we introduce multipartite intrinsic non-locality as a method for quantifying resources in the multipartite scenario of device-independent (DI) conference key agreement. We prov…

Paper

Extending the fair sampling assumption using causal diagrams

Valentin Gebhart and Augusto Smerzi,

Quantum 7, 897 (2023).

Discarding undesirable measurement results in Bell experiments opens the detection loophole that prevents a conclusive demonstration of nonlocality. As closing the detection loophole represe…

Paper

Overlapped grouping measurement: A unified framework for measuring quantum states

Bujiao Wu, Jinzhao Sun, Qi Huang, and Xiao Yuan,

Quantum 7, 896 (2023).

Quantum algorithms designed for realistic quantum many-body systems, such as chemistry and materials, usually require a large number of measurements of the Hamiltonian. Exploiting different…