Journals

Open Quantum System Dynamics from Infinite Tensor Network Contraction

Author(s): Valentin Link, Hong-Hao Tu, and Walter T. Strunz

Approaching the long-time dynamics of non-Markovian open quantum systems presents a challenging task if the bath is strongly coupled. Recent proposals address this problem through a representation of the so-called process tensor in terms of a tensor network. We show that for Gaussian environments hi…


[Phys. Rev. Lett. 132, 200403] Published Thu May 16, 2024

Categories: Journals, Physics

Selective Detection of Dynamics-Complete Set of Correlations via Quantum Channels

Author(s): Ze Wu, Ping Wang, Tianyun Wang, Yuchen Li, Ran Liu, Yuquan Chen, Xinhua Peng, and Ren-Bao Liu

Correlations of fluctuations are essential to understanding many-body systems and key information for advancing quantum technologies. To fully describe the dynamics of a physical system, all time-ordered correlations (TOCs), i.e., the dynamics-complete set of correlations are needed. The current mea…


[Phys. Rev. Lett. 132, 200802] Published Thu May 16, 2024

Categories: Journals, Physics

Long-time quantum scrambling and generalized tensor product structures

PRA: Quantum information - Wed, 2024-05-15 12:00

Author(s): Faidon Andreadakis, Emanuel Dallas, and Paolo Zanardi

Much recent work has been devoted to the study of information scrambling in quantum systems. In this paper, we study the long-time properties of the algebraic out-of-time-order-correlator (“A−OTOC”) and derive an analytical expression for its long-time average under the nonresonance condition. The A…


[Phys. Rev. A 109, 052424] Published Wed May 15, 2024

Categories: Journals, Physics

Optimization of algorithmic errors in analog quantum simulations

PRA: Quantum information - Wed, 2024-05-15 12:00

Author(s): Nikita A. Zemlevskiy, Henry F. Froland, and Stephan Caspar

A method for analyzing uncertainties in so-called analog quantum simulations could help scientists make precise predictions using these models.


[Phys. Rev. A 109, 052425] Published Wed May 15, 2024

Categories: Journals, Physics

Quantum entanglement estimation via symmetric-measurement-based positive maps

PRA: Quantum information - Wed, 2024-05-15 12:00

Author(s): Jiaxin Li, Hongmei Yao, Shao-Ming Fei, Zhaobing Fan, and Haitao Ma

We provide a class of positive and trace-preserving maps based on symmetric measurements. From these positive maps we present separability criteria, entanglement witnesses, and the lower bounds of concurrence. We show by detailed examples that our separability criteria, entanglement witnesses, and l…


[Phys. Rev. A 109, 052426] Published Wed May 15, 2024

Categories: Journals, Physics

Boson sampling from non-Gaussian states

PRA: Quantum information - Wed, 2024-05-15 12:00

Author(s): Craig S. Hamilton and Igor Jex

Boson sampling has emerged as an important tool to demonstrate the difference between quantum and classical computers and has attracted the interest of experimentalists and theoreticians. In this work we study boson sampling from general, single-mode states using a scheme that can generate any such …


[Phys. Rev. A 109, 052427] Published Wed May 15, 2024

Categories: Journals, Physics

Isometric tensor network optimization for extensive Hamiltonians is free of barren plateaus

PRA: Quantum information - Tue, 2024-05-14 12:00

Author(s): Qiang Miao and Thomas Barthel

Strongly correlated quantum many-body systems from condensed matter and particle physics are very hard to study classically and variational quantum algorithms (VQAs) may be hampered by barren plateaus, where energy gradients decay exponentially in the system size. The authors prove that this critical problem can be resolved by employing VQAs based on suitable isometric tensor network states, establishing a new route for the investigation of strongly correlated quantum matter on NISQ devices.


[Phys. Rev. A 109, L050402] Published Tue May 14, 2024

Categories: Journals, Physics

Higher-Form Symmetries under Weak Measurement

Author(s): Kaixiang Su, Nayan Myerson-Jain, Chong Wang, Chao-Ming Jian, and Cenke Xu

We aim to address the following question: if we start with a quantum state with a spontaneously broken higher-form symmetry, what is the fate of the system under weak local quantum measurements? We demonstrate that under certain conditions, a phase transition can be driven by weak measurements, whic…


[Phys. Rev. Lett. 132, 200402] Published Tue May 14, 2024

Categories: Journals, Physics

Experimental Quantum Homomorphic Encryption Using a Quantum Photonic Chip

Author(s): Yuan Li, Lin Cao, Wei Luo, Hui Zhang, Hong Cai, Muhammad Faeyz Karim, Feng Gao, Joseph Fitzsimons, Qinghua Song, and Ai-Qun Liu

Quantum fully homomorphic encryption is shown to be feasible on a compact silicon photonic chip, improving the prospects of a scalable, programmable, and stable quantum network infrastructure.


[Phys. Rev. Lett. 132, 200801] Published Tue May 14, 2024

Categories: Journals, Physics

Correcting biased noise using Gottesman-Kitaev-Preskill repetition code with noisy ancilla

PRA: Quantum information - Mon, 2024-05-13 12:00

Author(s): Zhifei Li and Daiqin Su

Concatenation of a bosonic code with a qubit code is one of the promising ways to achieve fault-tolerant quantum computation. As one of the most important bosonic codes, the Gottesman-Kitaev-Preskill (GKP) code is proposed to correct small displacement errors in phase space. If the noise in phase sp…


[Phys. Rev. A 109, 052420] Published Mon May 13, 2024

Categories: Journals, Physics

Massless interacting fermionic cellular automaton exhibiting bound states

PRA: Quantum information - Mon, 2024-05-13 12:00

Author(s): Edoardo Centofanti, Paolo Perinotti, and Alessandro Bisio

We present a fermionic cellular automaton model which describes massless Dirac fermions in 1+1 dimension coupled with local, number preserving interaction. The diagonalization of the two particle sector shows that specific values of the total momentum and of the coupling constant allow for the forma…


[Phys. Rev. A 109, 052421] Published Mon May 13, 2024

Categories: Journals, Physics

Strongest nonlocal sets with minimum cardinality in tripartite systems

PRA: Quantum information - Mon, 2024-05-13 12:00

Author(s): Xiao-Fan Zhen, Mao-Sheng Li, and Hui-Juan Zuo

Strong nonlocality, proposed by Halder et al. [Phys. Rev. Lett. 122, 040403 (2019)], is a stronger manifestation than quantum nonlocality. Subsequently, Shi et al. presented the concept of the strongest nonlocality [Quantum 6, 619 (2022)]. Recently, Li and Wang [Quantum 7, 1101 (2023)] posed the con…


[Phys. Rev. A 109, 052422] Published Mon May 13, 2024

Categories: Journals, Physics

Approximate complex amplitude encoding algorithm and its application to data classification problems

PRA: Quantum information - Mon, 2024-05-13 12:00

Author(s): Naoki Mitsuda, Tatsuhiro Ichimura, Kouhei Nakaji, Yohichi Suzuki, Tomoki Tanaka, Rudy Raymond, Hiroyuki Tezuka, Tamiya Onodera, and Naoki Yamamoto

Quantum computing has a potential to accelerate data processing efficiency, especially in machine learning, by exploiting special features such as the quantum interference. The major challenge in this application is that, in general, the task of loading a classical data vector into a quantum state r…


[Phys. Rev. A 109, 052423] Published Mon May 13, 2024

Categories: Journals, Physics

Entanglement Assisted Probe of the Non-Markovian to Markovian Transition in Open Quantum System Dynamics

Author(s): Chandrashekhar Gaikwad, Daria Kowsari, Carson Brame, Xingrui Song, Haimeng Zhang, Martina Esposito, Arpit Ranadive, Giulio Cappelli, Nicolas Roch, Eli M. Levenson-Falk, and Kater W. Murch

We utilize a superconducting qubit processor to experimentally probe non-Markovian dynamics of an entangled qubit pair. We prepare an entangled state between two qubits and monitor the evolution of entanglement over time as one of the qubits interacts with a small quantum environment consisting of a…


[Phys. Rev. Lett. 132, 200401] Published Mon May 13, 2024

Categories: Journals, Physics

Resource-efficient quantum-classical hybrid algorithm for energy gap evaluation

PRA: Quantum information - Fri, 2024-05-10 12:00

Author(s): Yongdan Yang, Ying Li, Xiaosi Xu, and Xiao Yuan

Estimating the eigenvalue or energy gap of a Hamiltonian H is vital for studying quantum many-body systems. Particularly, many of the problems in quantum chemistry, condensed-matter physics, and nuclear physics investigate the energy gap between two eigenstates. Hence, how to efficiently solve the e…


[Phys. Rev. A 109, 052416] Published Fri May 10, 2024

Categories: Journals, Physics

Witnessing entanglement in trapped-ion quantum error correction under realistic noise

PRA: Quantum information - Fri, 2024-05-10 12:00

Author(s): Andrea Rodriguez-Blanco, Farid Shahandeh, and Alejandro Bermudez

Quantum error correction (QEC) exploits redundancy by encoding logical information into multiple physical qubits. In current implementations of QEC, sequences of nonperfect two-qubit entangling gates are used to codify the information redundantly into multipartite entangled states. Also, to extract …


[Phys. Rev. A 109, 052417] Published Fri May 10, 2024

Categories: Journals, Physics

Nonlocal quantum state ensembles and quantum data hiding

PRA: Quantum information - Fri, 2024-05-10 12:00

Author(s): Donghoon Ha and Jeong San Kim

We consider the discrimination of bipartite quantum states and establish a relation between a nonlocal quantum state ensemble and quantum data-hiding processing. Using a bound on the optimal local discrimination of bipartite quantum states, we provide a sufficient condition for a bipartite quantum s…


[Phys. Rev. A 109, 052418] Published Fri May 10, 2024

Categories: Journals, Physics

Frobenius light cone and the shift unitary

PRA: Quantum information - Fri, 2024-05-10 12:00

Author(s): Chao Yin, Andrew Lucas, and David T. Stephen

We bound the time necessary to implement the shift unitary on a one-dimensional ring, both by using local Hamiltonians and those with power-law interactions. This time is constrained by the Frobenius light cone; hence we prove that (for certain power-law exponents) shift unitaries cannot be implemen…


[Phys. Rev. A 109, 052419] Published Fri May 10, 2024

Categories: Journals, Physics

Probabilistic imaginary-time evolution algorithm based on nonunitary quantum circuits

PRA: Quantum information - Thu, 2024-05-09 12:00

Author(s): Hao-Nan Xie, Shi-Jie Wei, Fan Yang, Zheng-An Wang, Chi-Tong Chen, Heng Fan, and Gui-Lu Long

Imaginary-time evolution is a powerful tool in the study of quantum physics. However, existing classical algorithms for simulating imaginary-time evolution suffer from high computational complexity as the dimension of the quantum system increases. In this study we propose a quantum algorithm for imp…


[Phys. Rev. A 109, 052414] Published Thu May 09, 2024

Categories: Journals, Physics

Single-shot labeling of quantum observables

PRA: Quantum information - Thu, 2024-05-09 12:00

Author(s): Nidhin Sudarsanan Ragini and Mario Ziman

We identify and study a particular class of distinguishability problems for quantum observables (positive-operator-valued measures), in which observables with permuted effects are involved, which we call the labeling problem. Consequently, we identify binary observables, which can be labeled perfect…


[Phys. Rev. A 109, 052415] Published Thu May 09, 2024

Categories: Journals, Physics
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