QUROPE Quantum Information Processing and Communication in Europe

Author(s): Taysa M. Mendonça, Lucas C. Céleri, Mauro Paternostro, and Diogo O. Soares-Pinto

This work sheds light on the mechanism that governs the propagation of quantum information from a system to its surrounding environment, highlighting the possibility of witnessing a quantum-to-classical transition in the process.

[Phys. Rev. A 110, L040401] Published Thu Oct 10, 2024

Author(s): Bohdan Bilash, Youngrong Lim, Hyukjoon Kwon, Yosep Kim, Hyang-Tag Lim, Wooyeong Song, and Yong-Su Kim

Identifying Bell states without destroying them is frequently dealt with in quantum technologies nowadays, such as in quantum communication and quantum computing. In practice, quantum entangled states are often distributed among distant parties, and it might be required to determine them separately …

[Phys. Rev. A 110, 042407] Published Wed Oct 09, 2024

Author(s): Federico Carollo and Igor Lesanovsky

Understanding quantum many-body systems with long-range or infinite-range interactions is of relevance across a broad set of physical disciplines, including quantum optics, nuclear magnetic resonance, and nuclear physics. From a theoretical viewpoint, these systems are appealing since they can be ef…

[Phys. Rev. Lett. 133, 150401] Published Tue Oct 08, 2024

Author(s): Elisa Bäumer, Vinay Tripathi, Alireza Seif, Daniel Lidar, and Derek S. Wang

In dynamic quantum circuits, classical information from midcircuit measurements is fed forward during circuit execution. This emerging capability of quantum computers confers numerous advantages that can enable more efficient and powerful protocols by drastically reducing the resource requirements f…

[Phys. Rev. Lett. 133, 150602] Published Tue Oct 08, 2024

Author(s): Guoqing Wang (王国庆), Minh-Thi Nguyen, and Paola Cappellaro

Solid-state platforms based on electronuclear spin systems are attractive candidates for rotation sensing due to their excellent sensitivity, stability, and compact size, compatible with industrial applications. Conventional spin-based gyroscopes measure the accumulated phase of a nuclear spin super…

[Phys. Rev. Lett. 133, 150801] Published Tue Oct 08, 2024

Author(s): Somshubhro Bandyopadhyay and Vincent Russo

We consider the problem of distinguishing between the elements of a bipartite maximally entangled orthonormal basis using local operations and classical communication (LOCC) and a partially entangled state acting as a resource. We derive an exact formula for the optimum success probability and find …

[Phys. Rev. A 110, 042406] Published Tue Oct 08, 2024

Author(s): Kazufumi Tanji, Hiroki Takahashi, Wojciech Roga, and Masahiro Takeoka

The qubit scalability imposes a paramount challenge in the field of quantum computing. Photonic interconnects between distinct quantum computing modules provide a solution to deal with this issue. The fundamental part of this approach is entanglement distribution via traveling photons emitted by mat…

[Phys. Rev. A 110, 042405] Published Tue Oct 08, 2024

Author(s): D. Petrosyan, S. Norrell, C. Poole, and M. Saffman

We propose and analyze an approach for fast syndrome measurements in an array of rubidium and cesium atomic qubits. The scheme works by implementing an interspecies controlled-not (cnotk) gate, entangling one cesium ancilla qubit with k≥1 rubidium qubits which are then used for state measurement. Ut…

[Phys. Rev. A 110, 042404] Published Tue Oct 08, 2024

Author(s): Huan Cao, Simon Morelli, Lee A. Rozema, Chao Zhang, Armin Tavakoli, and Philip Walther

Standard procedures for entanglement detection assume that experimenters can exactly implement specific quantum measurements. Here, we depart from such idealizations and investigate, in both theory and experiment, the detection of genuine multipartite entanglement when measurements are subject to sm…

[Phys. Rev. Lett. 133, 150201] Published Mon Oct 07, 2024

Author(s): T. L. M. Guedes, D. Winter, and M. Müller

Quantum cellular automata are alternative quantum-computing paradigms to quantum Turing machines and quantum circuits. Their working mechanisms are inherently automated, therefore measurement free, and they act in a translation invariant manner on all cells or qudits of a register, generating a glob…

[Phys. Rev. Lett. 133, 150601] Published Mon Oct 07, 2024

Author(s): Ido Golding and Ariel Amir

Gene expression, that is, the way in which genes encoded in the genome determine a cell’s growth and biological function, is crucially influenced by growth-related processes, such as replication of the genome and the doubling of all cellular components. Historically, this interplay has been largely ignored. This Colloquium describes recent experiments designed to shed light on this important coupling and theoretical models that take it into account.

[Rev. Mod. Phys. 96, 041001] Published Fri Oct 04, 2024

Author(s): Mattia Moroder, Oisín Culhane, Krissia Zawadzki, and John Goold

We investigate the quantum Mpemba effect from the perspective of nonequilibrium quantum thermodynamics by studying relaxation dynamics of quantum systems coupled to a Markovian heat bath, which are described by Davies maps. Starting from a state with coherences in the energy eigenbasis, we demonstra…

[Phys. Rev. Lett. 133, 140404] Published Fri Oct 04, 2024

Author(s): Shuo Liu, Hao-Kai Zhang, Shuai Yin, and Shi-Xin Zhang

Entanglement asymmetry, which serves as a diagnostic tool for symmetry breaking and a proxy for thermalization, has recently been proposed and studied in the context of symmetry restoration for quantum many-body systems undergoing a quench. In this Letter, we investigate symmetry restoration in vari…

[Phys. Rev. Lett. 133, 140405] Published Fri Oct 04, 2024

Author(s): Boning Huang (黄泊宁), Yongguan Ke (柯勇贯), Honghua Zhong (钟宏华), Yuri S. Kivshar, and Chaohong Lee (李朝红)

Bound states in the continuum (BICs) are localized modes residing in the radiation continuum. They were first predicted for single-particle states, and became a general feature of many wave systems. In many-body quantum physics, it is still unclear what would be a close analog of BICs, and whether i…

[Phys. Rev. Lett. 133, 140202] Published Thu Oct 03, 2024

Author(s): Baptiste Debecker, John Martin, and François Damanet

Controlling phase transitions in quantum systems via coupling to reservoirs has been mostly studied for idealized memory-less environments under the so-called Markov approximation. Yet, most quantum materials and experiments in the solid state, atomic, molecular and optical physics are coupled to re…

[Phys. Rev. Lett. 133, 140403] Published Thu Oct 03, 2024

Author(s): Qi Zhang, Wei Zhong, Ming-Ming Du, Shu-Ting Shen, Xi-Yun Li, An-Lei Zhang, Lan Zhou, and Yu-Bo Sheng

Device-independent (DI) quantum secret sharing (QSS) can relax the security assumptions about the devices' internal workings and provide QSS the highest level of security in theory. The original DI QSS protocol proved its correctness and completeness under a causal independence assumption regarding …

[Phys. Rev. A 110, 042403] Published Thu Oct 03, 2024

Author(s): Kacper Prech and Patrick P. Potts

Fluctuation theorems and the second law of thermodynamics are powerful relations constraining the behavior of out-of-equilibrium systems. While there exist generalizations of these relations to feedback controlled quantum systems, their applicability is limited, in particular when considering strong…

[Phys. Rev. Lett. 133, 140401] Published Tue Oct 01, 2024

Author(s): Cheng-Lin Deng, Yu Liu, Yu-Ran Zhang, Xue-Gang Li, Tao Liu, Chi-Tong Chen, Tong Liu, Cong-Wei Lu, Yong-Yi Wang, Tian-Ming Li, Cai-Ping Fang, Si-Yun Zhou, Jia-Cheng Song, Yue-Shan Xu, Yang He, Zheng-He Liu, Kai-Xuan Huang, Zhong-Cheng Xiang, Jie-Ci Wang, Dong-Ning Zheng, Guang-Ming Xue, Kai Xu, H. F. Yu, and Heng Fan

High-order topological phases of matter refer to the systems of n-dimensional bulk with the topology of m-th order, exhibiting (n−m)-dimensional boundary modes and can be characterized by topological pumping. Here, we experimentally demonstrate two types of second-order topological pumps, forming fo…

[Phys. Rev. Lett. 133, 140402] Published Tue Oct 01, 2024

Author(s): Xinfang Nie, Xuanran Zhu, Yu-ang Fan, Xinyue Long, Hongfeng Liu, Keyi Huang, Cheng Xi, Liangyu Che, Yuxuan Zheng, Yufang Feng, Xiaodong Yang, and Dawei Lu

The accurate determination of the electronic structure of strongly correlated materials using first principle methods is of paramount importance in condensed matter physics, computational chemistry, and material science. However, due to the exponential scaling of computational resources, incorporati…

[Phys. Rev. Lett. 133, 140602] Published Tue Oct 01, 2024

Author(s): Amir Mohammad Yaghoobianzadeh and Jawad A. Salehi

This paper proposes a class of tight upper and lower bounds for the optimal probability of correctly discriminating K quantum signals. The tightness of these bounds is shown analytically and numerically. These bounds are optimal for a binary quantum signal. The proposed upper bounds are based on a g…

[Phys. Rev. A 110, 042401] Published Tue Oct 01, 2024