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Quantum Science and Technology

Resumen/Descripción – provisto por la editorial en inglés
A multidisciplinary, high impact journal devoted to publishing research of the highest quality and significance covering the science and application of all quantum-enabled technologies.
Palabras clave – provistas por la editorial

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Institución detectada Período Navegá Descargá Solicitá
No detectada desde ago. 2016 / hasta dic. 2023 IOPScience

Información

Tipo de recurso:

revistas

ISSN electrónico

2058-9565

Editor responsable

IOP Publishing (IOP)

País de edición

Estados Unidos

Fecha de publicación

Tabla de contenidos

The pitfalls of planar spin-glass benchmarks: raising the bar for quantum annealers (again)

Salvatore MandràORCID; Helmut G KatzgraberORCID; Creighton Thomas

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 038501

The Engineering of a Scalable Multi-Site Communications System Utilizing Quantum Key Distribution (QKD)

Piotr K. TysowskiORCID; Xinhua Ling; Norbert Lütkenhaus; Michele Mosca

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. No disponible

A cost-effective measurement-device-independent quantum key distribution system for quantum networks

Raju Valivarthi; Qiang ZhouORCID; Caleb John; Francesco Marsili; Varun B Verma; Matthew D Shaw; Sae Woo Nam; Daniel OblakORCID; Wolfgang Tittel

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 04LT01

Quantum repeaters based on trapped ions with decoherence-free subspace encoding

M Zwerger; B P Lanyon; T E Northup; C A Muschik; W Dür; N Sangouard

<jats:title>Abstract</jats:title> <jats:p>Quantum repeaters provide an efficient solution to distribute Bell pairs over arbitrarily long distances. While scalable architectures are demanding regarding the number of qubits that need to be controlled, here we present a quantum repeater scheme aiming to extend the range of present day quantum communications that could be implemented in the near future with trapped ions in cavities. We focus on an architecture where ion-photon entangled states are created locally and subsequently processed with linear optics to create elementary links of ion-ion entangled states. These links are then used to distribute entangled pairs over long distances using successive entanglement swapping operations performed using deterministic ion-ion gates. We show how this architecture can be implemented while encoding the qubits in a decoherence-free subspace to protect them against collective dephasing. This results in a protocol that can be used to violate a Bell inequality over distances of about 800 km assuming state-of-the-art parameters. We discuss how this could be improved to several thousand kilometres in future setups.</jats:p>

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 044001

Performance evaluation of coherent Ising machines against classical neural networks

Yoshitaka Haribara; Hitoshi Ishikawa; Shoko Utsunomiya; Kazuyuki Aihara; Yoshihisa Yamamoto

<jats:title>Abstract</jats:title> <jats:p>The coherent Ising machine is expected to find a near-optimal solution in various combinatorial optimization problems, which has been experimentally confirmed with optical parametric oscillators and a field programmable gate array circuit. The similar mathematical models were proposed three decades ago by Hopfield <jats:italic>et al</jats:italic> in the context of classical neural networks. In this article, we compare the computational performance of both models.</jats:p>

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 044002

Finite-key-size effect in a commercial plug-and-play QKD system

Poompong ChaiwongkhotORCID; Shihan Sajeed; Lars Lydersen; Vadim Makarov

<jats:title>Abstract</jats:title> <jats:p>A security evaluation against the finite-key-size effect was performed for a commercial plug-and-play quantum key distribution (QKD) system. We demonstrate the ability of an eavesdropper to force the system to distill key from a smaller length of sifted-key. We also derive a key-rate equation that is specific for this system. This equation provides bounds above the upper bound of secure key under finite-key-size analysis. From this equation and our experimental data, we show that the keys that have been distilled from the smaller sifted-key size fall above our bound. Thus, their security is not covered by finite-key-size analysis. Experimentally, we could consistently force the system to generate the key outside of the bound. We also test manufacturer’s software update. Although all the keys after the patch fall under our bound, their security cannot be guaranteed under this analysis. Our methodology can be used for security certification and standardization of QKD systems.</jats:p>

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 044003

Reaching for the quantum limits in the simultaneous estimation of phase and phase diffusion

Magdalena Szczykulska; Tillmann Baumgratz; Animesh Datta

<jats:title>Abstract</jats:title> <jats:p>Phase diffusion invariably accompanies all phase estimation strategies, quantum or classical. A precise estimation of the former can often provide valuable understanding of the physics of the phase generating phenomena itself. We theoretically examine the performance of fixed-particle number probe states in the simultaneous estimation of phase and collective phase diffusion. We derive analytical quantum limits associated with the simultaneous local estimation of phase and phase diffusion within the quantum Cramér-Rao bound framework in the regimes of large and small phase diffusive noise. The former is for a general fixed-particle number state and the latter for Holland-Burnett states, for which we show quantum-enhanced estimation of phase as well as phase diffusion. We next investigate the simultaneous attainability of these quantum limits using projective measurements acting on a single copy of the state in terms of a trade-off relation. In particular, we are interested how this trade-off varies as a function of the dimension of the state. We derive an analytical bound for this trade-off in the large phase diffusion regime for a particular form of the measurement, and show that the maximum of <jats:inline-formula> <jats:tex-math> <?CDATA $2,$?> </jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>2</mml:mn> <mml:mo>,</mml:mo> </mml:math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="qstaa7fa9ieqn1.gif" xlink:type="simple" /> </jats:inline-formula> set by the quantum Cramér-Rao bound, is attainable. Further, we show numerical evidence that as diffusion approaches zero, the optimal trade-off relation approaches 1 for Holland-Burnett states. These numerical results are valid in the small particle number regime and suggest that the trade-off for estimating one parameter with quantum-limited precision leads to a complete lack of precision for the other parameter as the diffusion strength approaches zero. Finally, we provide numerical results showing behaviour of the trade-off for a general value of phase diffusion when using Holland-Burnett probe states.</jats:p>

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 044004

Number-unconstrained quantum sensing

Morgan W MitchellORCID

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 044005

What is the optimal way to prepare a Bell state using measurement and feedback?

Leigh MartinORCID; Mahrud Sayrafi; K Birgitta Whaley

<jats:title>Abstract</jats:title> <jats:p>Recent work has shown that the use of quantum feedback can significantly enhance both the speed and success rate of measurement-based remote entanglement generation, but it is generally unknown what feedback protocols are optimal for these tasks. Here we consider two common measurements that are capable of projecting into pairwise entangled states, namely half- and full-parity measurements of two qubits, and determine in each case a globally optimal protocol for generation of entanglement. For the half-parity measurement, we rederive a previously described protocol using more general methods and prove that it is globally optimal for several figures of merit, including maximal concurrence or fidelity and minimal time to reach a specified concurrence or fidelity. For the full-parity measurement, we derive a protocol for rapid entanglement generation related to that of (Hill, Ralph, <jats:italic>Phys. Rev. A</jats:italic> <jats:bold>77</jats:bold>, 014305), and then map the dynamics of the concurrence of the state to the Bloch vector length of an effective qubit. This mapping allows us to prove several optimality results for feedback protocols with full-parity measurements. We further show that our full-parity protocol transfers entanglement optimally from one qubit to the other amongst all measurement-based schemes. The methods developed here will be useful for deriving feedback protocols and determining their optimality properties in many other quantum systems subject to measurement and unitary operations.</jats:p>

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 044006

Coupled qubits as a quantum heat switch

B Karimi; J P Pekola; M CampisiORCID; R Fazio

Palabras clave: Electrical and Electronic Engineering; Physics and Astronomy (miscellaneous); Materials Science (miscellaneous); Atomic and Molecular Physics, and Optics.

Pp. 044007