Author(s): Toshiaki Kanai, Dafei Jin, and Wei Guo
Single electrons trapped on solid-neon surfaces have recently emerged as a promising platform for charge qubits. Experimental results have revealed their exceptionally long coherence times, yet the actual quantum states of these trapped electrons, presumably on imperfectly flat neon surfaces, remain…
[Phys. Rev. Lett. 132, 250603] Published Tue Jun 18, 2024
Author(s): Ping Li and Yongming Li
Quantum coherence is an intrinsic property within a single quantum system. Many different coherent resource theories have been proposed to characterize this property within the framework of resource theory. This difference is based on the difference in the identification of “free” operations. In thi…
[Phys. Rev. A 109, 062424] Published Tue Jun 18, 2024
Author(s): Mingrui Jing, Geng Liu, Hongbin Ren, and Xin Wang
Learning probability distribution is an essential framework in classical learning theory. As a counterpart, quantum state learning has spurred the exploration of quantum machine learning theory. However, as dimensionality increases, learning a high-dimensional unknown quantum state via conventional …
[Phys. Rev. A 109, 062425] Published Tue Jun 18, 2024
Author(s): Abhi Kumar Sharma and Shayan Srinivasa Garani
Magic-state distillation is a protocol to purify noisy quantum states using quantum stabilizer codes. In this paper, we provide conditions for identifying magic states along with analytical expressions for computing the noise threshold. Through quantum entropic results, we prove the convergence of t…
[Phys. Rev. A 109, 062426] Published Tue Jun 18, 2024
Author(s): Kristian Piscicchia, Sandro Donadi, Simone Manti, Angelo Bassi, Maaneli Derakhshani, Lajos Diósi, and Catalina Curceanu
In this work the spontaneous electromagnetic radiation from atomic systems, induced by dynamical wave-function collapse, is investigated in the x-ray domain. Strong departures are evidenced with respect to the simple cases considered until now in the literature, in which the emission is either perfe…
[Phys. Rev. Lett. 132, 250203] Published Tue Jun 18, 2024
Author(s): Sai Li, De-Jian Pan, Yuan-Ke Zhu, Jia-Lang Zhou, Wen-Cui Liao, Wei-Xin Zhang, Zhen-Tao Liang, Qing-Xian Lv, Haifeng Yu, Zheng-Yuan Xue, Hui Yan, and Shi-Liang Zhu
The Hamiltonian, which determines the evolution of a quantum system, is fundamental in quantum physics. Therefore, it is crucial to implement high-precision generation and measurement of the Hamiltonian in a practical quantum system. Here, we experimentally demonstrate ultrahigh-precision Hamiltonia…
[Phys. Rev. Lett. 132, 250204] Published Tue Jun 18, 2024
Author(s): Mykyta Onizhuk, Yu-Xin Wang (王语馨), Jonah Nagura, Aashish A. Clerk, and Giulia Galli
We propose a new approach to simulate the decoherence of a central spin coupled to an interacting dissipative spin bath with cluster-correlation expansion techniques. We benchmark the approach on generic 1D and 2D spin baths and find excellent agreement with numerically exact simulations. Our calcul…
[Phys. Rev. Lett. 132, 250401] Published Tue Jun 18, 2024
Author(s): Yujie Zhang and Eric Chitambar
Two independent papers answer an important open question by showing that generalized measurements are not more powerful than projection-valued measurements in quantum steering with two-qubit Werner states.
[Phys. Rev. Lett. 132, 250201] Published Mon Jun 17, 2024
Author(s): Martin J. Renner
Two independent papers answer an important open question by showing that generalized measurements are not more powerful than projection-valued measurements in quantum steering with two-qubit Werner states.
[Phys. Rev. Lett. 132, 250202] Published Mon Jun 17, 2024
Author(s): David T. Stephen, Wen Wei Ho, Tzu-Chieh Wei, Robert Raussendorf, and Ruben Verresen
A powerful tool emerging from the study of many-body quantum dynamics is that of dual-unitary circuits, which are unitary even when read “sideways,” i.e., along the spatial direction. Here, we show that this provides the ideal framework to understand and expand on the notion of measurement-based qua…
[Phys. Rev. Lett. 132, 250601] Published Mon Jun 17, 2024
Author(s): Guo Zheng, Wenhao He, Gideon Lee, and Liang Jiang
The Knill-Laflamme conditions distinguish exact quantum error correction codes, and they have played a critical role in the discovery of state-of-the-art codes. However, the family of exact codes is a very restrictive one and does not necessarily contain the best-performing codes. Therefore, it is d…
[Phys. Rev. Lett. 132, 250602] Published Mon Jun 17, 2024
Author(s): Si-Yu Guan, Hong-Fu Wang, and Xuexi Yi
We consider an all-optical system consisting of two whispering-gallery-mode microring resonators and two adjacent optical waveguides. Pumping fields from different directions can simultaneously excite both clockwise and counterclockwise modes in the two resonators. When the propagation direction of …
[Phys. Rev. A 109, 062423] Published Mon Jun 17, 2024
Author(s): Sho Sugiura, Arkopal Dutt, William J. Munro, Sina Zeytinoğlu, and Isaac L. Chuang
In many natural and engineered systems, unknown quantum channels act on a subsystem that cannot be directly controlled and measured, but is instead learned through a controllable subsystem that weakly interacts with it. We study quantum channel discrimination (QCD) under these restrictions, which we…
[Phys. Rev. Lett. 132, 240805] Published Fri Jun 14, 2024
Author(s): Ruyu Yang, Wencheng Zhao, and Tingting Chen
This article focuses on the development of scalable and qubit-efficient algorithms for computing power functions of random quantum states. Two algorithms, based on the Hadamard Test and Gate Set Tomography, are proposed. We provide a comparative analysis of their computational outcomes, accompanied …
[Phys. Rev. A 109, 062421] Published Fri Jun 14, 2024
Author(s): Jack Y. Araz, Michael Spannowsky, and Matthew Wingate
This study investigates the thermal properties of the repulsive Fermi-Hubbard model with chemical potential using variational quantum algorithms, crucial in comprehending particle behavior within lattices at high temperatures in condensed matter systems. Conventional computational methods encounter …
[Phys. Rev. A 109, 062422] Published Fri Jun 14, 2024
Author(s): Jiru Liu, Wenchao Ge, and M. Suhail Zubairy
Gaussian states with nonclassical properties such as squeezing and entanglement serve as crucial resources for quantum information processing. Accurately quantifying these properties within multimode Gaussian states has posed some challenges. To address this, we introduce a unified quantification: t…
[Phys. Rev. Lett. 132, 240201] Published Thu Jun 13, 2024
Author(s): Aparajita Bhattacharyya, Kornikar Sen, and Ujjwal Sen
Energy extraction from quantum batteries by means of completely positive trace-preserving (CPTP) maps leads to the concept of CPTP-local passive states, which identify bipartite states from which no energy can be squeezed out by applying any CPTP map to a particular subsystem. We prove, for arbitrar…
[Phys. Rev. Lett. 132, 240401] Published Thu Jun 13, 2024
Author(s): Shuo Liu, Ming-Rui Li, Shi-Xin Zhang, and Shao-Kai Jian
In the context of measurement-induced entanglement phase transitions, the influence of quantum noises, which are inherent in real physical systems, is of great importance and experimental relevance. In this Letter, we present a comprehensive theoretical analysis of the effects of both temporally unc…
[Phys. Rev. Lett. 132, 240402] Published Thu Jun 13, 2024
Author(s): Tobias Haug, Soovin Lee, and M. S. Kim
Stabilizer entropies (SEs) are measures of nonstabilizerness or “magic” that quantify the degree to which a state is described by stabilizers. SEs are especially interesting due to their connections to scrambling, localization and property testing. However, applications have been limited so far as p…
[Phys. Rev. Lett. 132, 240602] Published Thu Jun 13, 2024
Author(s): Ming-Chien Hsu, En-Jui Kuo, Wei-Hsuan Yu, Jian-Feng Cai, and Min-Hsiu Hsieh
The recovery of an unknown density matrix of large size requires huge computational resources. State-of-the-art performance has recently been achieved with the factored gradient descent (FGD) algorithm and its variants since they are able to mitigate the dimensionality barrier by utilizing some of t…
[Phys. Rev. Lett. 132, 240804] Published Thu Jun 13, 2024