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Archives: Paper

Paper published by Quantum

Paper

Parallel entangling gate operations and two-way quantum communication in spin chains

Rozhin Yousefjani and Abolfazl Bayat,

Quantum 5, 460 (2021).

The power of a quantum circuit is determined through the number of two-qubit entangling gates that can be performed within the coherence time of the system. In the absence of parallel quantu…

Paper

Time-dependent unbounded Hamiltonian simulation with vector norm scaling

Dong An, Di Fang, and Lin Lin,

Quantum 5, 459 (2021).

The accuracy of quantum dynamics simulation is usually measured by the error of the unitary evolution operator in the operator norm, which in turn depends on certain norm of the Hamiltonian.…

Paper

Versatile Super-Sensitive Metrology Using Induced Coherence

Nathaniel R. Miller, Sven Ramelow, and William N. Plick,

Quantum 5, 458 (2021).

We theoretically analyze the phase sensitivity of the Induced-Coherence (Mandel-Type) Interferometer, including the case where the sensitivity is "boosted" into the bright input regime with…

Paper

How dynamics constrains probabilities in general probabilistic theories

Thomas D. Galley and Lluis Masanes,

Quantum 5, 457 (2021).

We introduce a general framework for analysing general probabilistic theories, which emphasises the distinction between the dynamical and probabilistic structures of a system. The dynamical…

Paper

Contextual Subspace Variational Quantum Eigensolver

William M. Kirby, Andrew Tranter, and Peter J. Love,

Quantum 5, 456 (2021).

We describe the $\textit{contextual subspace variational quantum eigensolver}$ (CS-VQE), a hybrid quantum-classical algorithm for approximating the ground state energy of a Hamiltonian. The ap…

Paper

Multi-time correlations in the positive-P, Q, and doubled phase-space representations

Piotr Deuar,

Quantum 5, 455 (2021).

A number of physically intuitive results for the calculation of multi-time correlations in phase-space representations of quantum mechanics are obtained. They relate time-dependent stochasti…

Paper

Qubit-efficient encoding schemes for binary optimisation problems

Benjamin Tan, Marc-Antoine Lemonde, Supanut Thanasilp, Jirawat Tangpanitanon, and Dimitris G. Angelakis,

Quantum 5, 454 (2021).

We propose and analyze a set of variational quantum algorithms for solving quadratic unconstrained binary optimization problems where a problem consisting of $n_c$ classical variables can be i…

Paper

Quantum Chaos is Quantum

Lorenzo Leone, Salvatore F. E. Oliviero, You Zhou, and Alioscia Hamma,

Quantum 5, 453 (2021).

It is well known that a quantum circuit on $N$ qubits composed of Clifford gates with the addition of $k$ non Clifford gates can be simulated on a classical computer by an algorithm scaling as…

Paper

Error mitigation on a near-term quantum photonic device

Daiqin Su, Robert Israel, Kunal Sharma, Haoyu Qi, Ish Dhand, and Kamil Brádler,

Quantum 5, 452 (2021).

Photon loss is destructive to the performance of quantum photonic devices and therefore suppressing the effects of photon loss is paramount to photonic quantum technologies. We present two s…

Paper

Local master equations bypass the secular approximation

Stefano Scali, Janet Anders, and Luis A. Correa,

Quantum 5, 451 (2021).

Master equations are a vital tool to model heat flow through nanoscale thermodynamic systems. Most practical devices are made up of interacting sub-system, and are often modelled using eithe…

Paper

Designing locally maximally entangled quantum states with arbitrary local symmetries

Oskar Słowik, Adam Sawicki, and Tomasz Maciążek,

Quantum 5, 450 (2021).

One of the key ingredients of many LOCC protocols in quantum information is a multiparticle (locally) maximally entangled quantum state, aka a critical state, that possesses local symmetries…

Paper

Shortcuts to Squeezed Thermal States

Léonce Dupays and Aurélia Chenu,

Quantum 5, 449 (2021).

Squeezed state in harmonic systems can be generated through a variety of techniques, including varying the oscillator frequency or using nonlinear two-photon Raman interaction. We focus on t…

Paper

Certifying optimality for convex quantum channel optimization problems

Bryan Coutts, Mark Girard, and John Watrous,

Quantum 5, 448 (2021).

We identify necessary and sufficient conditions for a quantum channel to be optimal for any convex optimization problem in which the optimization is taken over the set of all quantum channel…

Paper

Photonic quantum data locking

Zixin Huang, Peter P. Rohde, Dominic W. Berry, Pieter Kok, Jonathan P. Dowling, and Cosmo Lupo,

Quantum 5, 447 (2021).

Quantum data locking is a quantum phenomenon that allows us to encrypt a long message with a small secret key with information-theoretic security. This is in sharp contrast with classical in…

Paper

Weakly invasive metrology: quantum advantage and physical implementations

M. Perarnau-Llobet, D. Malz, and J. I. Cirac,

Quantum 5, 446 (2021).

We consider the estimation of a Hamiltonian parameter of a set of highly photosensitive samples, which are damaged after a few photons $N_{\rm abs}$ are absorbed, for a total time $T$. The sampl…

Paper

Reconstructing quantum theory from diagrammatic postulates

John H. Selby, Carlo Maria Scandolo, and Bob Coecke,

Quantum 5, 445 (2021).

A reconstruction of quantum theory refers to both a mathematical and a conceptual paradigm that allows one to derive the usual formulation of quantum theory from a set of primitive assumptio…

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