PRA: Quantum information

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Recently published articles in Phys. Rev. A in the Table of Content section "Quantum information"
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User-friendly confidence regions for quantum state tomography

Wed, 2024-06-12 12:00

Author(s): Carlos de Gois and Matthias Kleinmann

Quantum state tomography is the standard technique for reconstructing a quantum state from experimental data. In the regime of finite statistics, experimental data cannot give perfect information about the quantum state. A common way to express this limited knowledge is by providing confidence regio…


[Phys. Rev. A 109, 062417] Published Wed Jun 12, 2024

Categories: Journals, Physics

Reexamination of quantum state transformations with zero communication

Wed, 2024-06-12 12:00

Author(s): Ian George and Eric Chitambar

It is known that general convertibility of bipartite entangled states is not possible to arbitrary error without some classical communication. While some tradeoffs between communication cost and conversion error have been proven, these bounds can be very loose. In particular, there are many cases in…


[Phys. Rev. A 109, 062418] Published Wed Jun 12, 2024

Categories: Journals, Physics

Partial-transpose-guided entanglement classes and minimum noise filtering in many-body Gaussian quantum systems

Tue, 2024-06-11 12:00

Author(s): Boyu Gao and Natalie Klco

The reduction and distortion of quantum correlations in the presence of classical noise leads to varied levels of inefficiency in the availability of entanglement as a resource for quantum information processing protocols. While generically minimizing required entanglement for mixed quantum states r…


[Phys. Rev. A 109, 062413] Published Tue Jun 11, 2024

Categories: Journals, Physics

Quantum control for the Zeno effect with noise

Tue, 2024-06-11 12:00

Author(s): Haorui Chen and Shengshi Pang

The quantum Zeno effect is a distinctive phenomenon in quantum mechanics, describing the nontrivial effect of frequent projective measurements on hindering the evolution of a quantum system. However, when subjected to environmental noise, the quantum system may dissipate, and the quantum Zeno effect…


[Phys. Rev. A 109, 062414] Published Tue Jun 11, 2024

Categories: Journals, Physics

Dual-frame optimization for informationally complete quantum measurements

Tue, 2024-06-11 12:00

Author(s): Laurin E. Fischer, Timothée Dao, Ivano Tavernelli, and Francesco Tacchino

Randomized measurement protocols such as classical shadows represent powerful resources for quantum technologies, with applications ranging from quantum state characterization and process tomography to machine learning and error mitigation. Recently, the notion of measurement dual frames, in which c…


[Phys. Rev. A 109, 062415] Published Tue Jun 11, 2024

Categories: Journals, Physics

One-shot and asymptotic classical capacity in general physical theories

Tue, 2024-06-11 12:00

Author(s): Shintaro Minagawa and Hayato Arai

With the recent development of quantum information theory, some attempts have been made to construct information theory beyond quantum theory. Here, we consider hypothesis-testing relative entropy and one-shot classical capacity, that is, the optimal rate of classical information transmitted by usin…


[Phys. Rev. A 109, 062416] Published Tue Jun 11, 2024

Categories: Journals, Physics

All-optical correlated noisy channel and its application in recovering quantum coherence

Mon, 2024-06-10 12:00

Author(s): Dan Lei, Disheng Guo, Jun Xin, and Xiao-Ming Lu

Attenuation and amplification are the most common processes for optical communications. Amplification can be used to compensate the attenuation of the complex amplitude of an optical field, but is unable to recover the coherence lost, provided that the attenuation channel and the amplification chann…


[Phys. Rev. A 109, 062410] Published Mon Jun 10, 2024

Categories: Journals, Physics

Concatenating quantum error-correcting codes with decoherence-free subspaces and vice versa

Mon, 2024-06-10 12:00

Author(s): Nihar Ranjan Dash, Sanjoy Dutta, R. Srikanth, and Subhashish Banerjee

Quantum error-correcting codes (QECCs) and decoherence-free subspace (DFS) codes provide active and passive means, respectively, to address certain types of errors that arise during quantum computation. The latter technique is suitable to correct correlated errors with certain symmetries and the for…


[Phys. Rev. A 109, 062411] Published Mon Jun 10, 2024

Categories: Journals, Physics

Enhanced observable estimation through classical optimization of informationally overcomplete measurement data: Beyond classical shadows

Mon, 2024-06-10 12:00

Author(s): Joonas Malmi, Keijo Korhonen, Daniel Cavalcanti, and Guillermo García-Pérez

In recent years, informationally complete measurements have attracted considerable attention, especially in the context of classical shadows. In the particular case of informationally overcomplete measurements, for which the number of possible outcomes exceeds the dimension of the space of linear op…


[Phys. Rev. A 109, 062412] Published Mon Jun 10, 2024

Categories: Journals, Physics

Hexapartite coherent feedback control in four-wave mixing with a spatially structured pump

Fri, 2024-06-07 12:00

Author(s): Haiyan He, Kai Zhang, and Jietai Jing

Quantum coherent feedback control (CFC) has been widely applied to prepare and manipulate nonclassical beams. In this paper, we utilize an optical beam splitter with tunable reflectivity k as a feedback controller and theoretically construct a CFC system based on four-wave mixing (FWM) processes wit…


[Phys. Rev. A 109, 062409] Published Fri Jun 07, 2024

Categories: Journals, Physics

Quantum multigraph states and multihypergraph states

Thu, 2024-06-06 12:00

Author(s): Xiao-Dong Zhang, Bin-Bin Cai, and Song Lin

In this paper we propose two classes of multiparticle entangled states: multigraph and multihypergraph states. Two types of operations are designed to correspond to the edges and hyperedges to prepare the states. Furthermore, multigraph and multihypergraph states contain qudit graph and hypergraph s…


[Phys. Rev. A 109, 062407] Published Thu Jun 06, 2024

Categories: Journals, Physics

Beating one bit of communication with quantum correlations in smaller dimensions

Thu, 2024-06-06 12:00

Author(s): Peter Sidajaya and Valerio Scarani

As a consequence of Bell's theorem, the statistics of measurements on some entangled states cannot be simulated with local hidden variables alone. The amount of communication that must be supplied is an intuitive quantifier of nonclassicality. While it is obvious that this amount can be very large i…


[Phys. Rev. A 109, 062408] Published Thu Jun 06, 2024

Categories: Journals, Physics

Relations between Markovian and non-Markovian correlations in multitime quantum processes

Mon, 2024-06-03 12:00

Author(s): Guilherme Zambon and Diogo O. Soares-Pinto

In the dynamics of open quantum systems, information may propagate in time through either the system or the environment, giving rise to Markovian and non-Markovian temporal correlations, respectively. However, despite their notable coexistence in most physical situations, it is not yet clear how the…


[Phys. Rev. A 109, 062401] Published Mon Jun 03, 2024

Categories: Journals, Physics

Simulating the spin-boson model with a controllable reservoir in an ion trap

Mon, 2024-06-03 12:00

Author(s): G.-X. Wang, Y.-K. Wu, R. Yao, W.-Q. Lian, Z.-J. Cheng, Y.-L. Xu, C. Zhang, Y. Jiang, Y.-Z. Xu, B.-X. Qi, P.-Y. Hou, Z.-C. Zhou, L. He, and L.-M. Duan

The spin-boson model is a prototypical model for open quantum dynamics. Here we simulate the spin-boson model using a chain of trapped ions in which a spin is coupled to a structured reservoir of bosonic modes. We engineer the spectral density of the reservoir by adjusting the ion number, the target…


[Phys. Rev. A 109, 062402] Published Mon Jun 03, 2024

Categories: Journals, Physics

Investigating controlled teleportation capability of quantum states with respect to $k$-separability

Mon, 2024-06-03 12:00

Author(s): Minjin Choi, Jeonghyeon Shin, Gunho Lee, and Eunok Bae

Quantum teleportation is an essential application of quantum entanglement. The examination of teleportation fidelity in two-party standard teleportation schemes reveals a critical threshold distinguishing separable and entangled states. For separable states, their teleportation fidelities cannot exc…


[Phys. Rev. A 109, 062403] Published Mon Jun 03, 2024

Categories: Journals, Physics

Active learning for quantum mechanical measurements

Mon, 2024-06-03 12:00

Author(s): Ruidi Zhu, Ciara Pike-Burke, and Florian Mintert

The experimental evaluation of many quantum mechanical quantities requires the estimation of several directly measurable observables, such as local observables. Due to the necessity to repeat experiments on individual quantum systems in order to estimate expectation values of observables, the questi…


[Phys. Rev. A 109, 062404] Published Mon Jun 03, 2024

Categories: Journals, Physics

Sufficient conditions, lower bounds, and trade-off relations for quantumness in Kirkwood-Dirac quasiprobability

Mon, 2024-06-03 12:00

Author(s): Agung Budiyono

Kirkwood-Dirac (KD) quasiprobability is a quantum analog of classical phase space probability. It offers an informationally complete representation of quantum state wherein the quantumness associated with quantum noncommutativity manifests in its nonclassical values, i.e., the nonreal and/or negativ…


[Phys. Rev. A 109, 062405] Published Mon Jun 03, 2024

Categories: Journals, Physics

Classical shadow tomography with mutually unbiased bases

Mon, 2024-06-03 12:00

Author(s): Yu Wang and Wei Cui

Classical shadow tomography, harnessing randomized informationally complete (IC) measurements, provides an effective avenue for predicting many properties of unknown quantum states. In n-qubit systems, projections onto 2n+1 mutually unbiased bases (MUBs) are widely recognized as minimal and optimal …


[Phys. Rev. A 109, 062406] Published Mon Jun 03, 2024

Categories: Journals, Physics

Coherence quantifier based on the quantum optimal transport cost

Fri, 2024-05-31 12:00

Author(s): Xian Shi

In this work, we present a coherence measure based on the quantum optimal transport cost in terms of the convex roof extended method. We also obtain the analytical solutions of the quantifier for pure states. We also propose an operational interpretation of the coherence measure for pure states.


[Phys. Rev. A 109, 052443] Published Fri May 31, 2024

Categories: Journals, Physics

Optimal joint cutting of two-qubit rotation gates

Thu, 2024-05-30 12:00

Author(s): Christian Ufrecht, Laura S. Herzog, Daniel D. Scherer, Maniraman Periyasamy, Sebastian Rietsch, Axel Plinge, and Christopher Mutschler

Circuit cutting, the partitioning of quantum circuits into smaller independent fragments, has become a promising avenue for scaling up current quantum-computing experiments. Here, we introduce a scheme for joint cutting of two-qubit rotation gates based on a virtual gate-teleportation protocol. With…


[Phys. Rev. A 109, 052440] Published Thu May 30, 2024

Categories: Journals, Physics