Showing 2020 · quant-phShow all

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quant-ph2020★ 11 cited

Schrödinger's problem with cats: measurements and states in the Groupoid Picture of Quantum Mechanics

Florio M. Ciaglia, Fabio Di Cosmo, Alberto Ibort +1

Schrödinger's famous Gedankenexperiment involving a cat is used as a motivation to discuss the evolution of states of the composition of classical and quantum systems in the groupo…

quant-ph2020★ 12 cited

Classification and reconstruction of optical quantum states with deep neural networks

Shahnawaz Ahmed, Carlos Sánchez Muñoz, Franco Nori +1

We apply deep-neural-network-based techniques to quantum state classification and reconstruction. We demonstrate high classification accuracies and reconstruction fidelities, even…

quant-ph2020★ 26 cited

Two-orbital quantum discord in fermion systems

Javier Faba, Vicente Martín, Luis Robledo

A simple expression to compute the quantum discord between two orbitals in fermion systems is derived using the parity superselection rule. As the correlation between orbitals depe…

quant-ph2020★ 38 cited

Molecular photodissociation enabled by ultrafast plasmon decay

José Torres-Sánchez, Johannes Feist

We propose a strategy for enabling photodissociation of a normally photostable molecule through coupling to a nanoparticle plasmon. The large possible coupling on the single-molecu…

quant-ph2020★ 21 cited

Detecting Entanglement can be More Effective with Inequivalent Mutually Unbiased Bases

B. C. Hiesmayr, D. McNulty, S. Baek +3

Mutually unbiased bases (MUBs) provide a standard tool in the verification of quantum states, especially when harnessing a complete set for optimal quantum state tomography. In thi…

quant-ph2020★ 1 cited

Bulk-edge correspondence in the Haldane phase of the bilinear-biquadratic spin-1 Hamiltonian

Sudipto Singha Roy, Silvia N. Santalla, Javier Rodríguez-Laguna +1

The Haldane phase is the prototype of symmetry protected topological (SPT) phases of spin chain systems. It can be protected by several symmetries having in common the degeneracy o…

quant-ph2020★ 83 cited

Unified approach to data-driven quantum error mitigation

Angus Lowe, Max Hunter Gordon, Piotr Czarnik +3

Achieving near-term quantum advantage will require effective methods for mitigating hardware noise. Data-driven approaches to error mitigation are promising, with popular examples…

quant-ph2020★ 12 cited

The short periodic orbit method for excited chaotic eigenfunctions

F. Revuelta, E. Vergini, R. M. Benito +1

In this paper [published in Phys. Rev. E 102, 042210 (2020)], a new method for the calculation of excited chaotic eigenfunctions in arbitrary energy windows is presented. We demons…

quant-ph2020★ 123 cited

Mitiq: A software package for error mitigation on noisy quantum computers

Ryan LaRose, Andrea Mari, Sarah Kaiser +16

We introduce Mitiq, a Python package for error mitigation on noisy quantum computers. Error mitigation techniques can reduce the impact of noise on near-term quantum computers with…

quant-ph2020★ 50 cited

Hybrid Thermal Machines: Generalized Thermodynamic Resources for Multitasking

Gonzalo Manzano, Rafael Sánchez, Ralph Silva +4

Thermal machines perform useful tasks--such as producing work, cooling, or heating--by exchanging energy, and possibly additional conserved quantities such as particles, with reser…

quant-ph2020★ 135 cited

Qibo: a framework for quantum simulation with hardware acceleration

Stavros Efthymiou, Sergi Ramos-Calderer, Carlos Bravo-Prieto +5

We present Qibo, a new open-source software for fast evaluation of quantum circuits and adiabatic evolution which takes full advantage of hardware accelerators. The growing interes…

quant-ph2020★ 3 cited

Long-distance heat transfer between molecular systems through a hybrid plasmonic-photonic nanoresonator

S. Mahmoud Ashrafi, R. Malekfar, A. R. Bahrampour +1

We introduce a hybrid plasmonic-photonic cavity setup that can be used to induce and control long-distance heat transfer between molecular systems through optomechanical interactio…

quant-ph2020★ 105 cited

Macroscopic QED for quantum nanophotonics: Emitter-centered modes as a minimal basis for multi-emitter problems

Johannes Feist, Antonio I. Fernández-Domínguez, Francisco J. García-Vidal

We present an overview of the framework of macroscopic quantum electrodynamics from a quantum nanophotonics perspective. Particularly, we focus our attention on three aspects of th…

quant-ph2020★ 16 cited

Quantum State Tomography with Conditional Generative Adversarial Networks

Shahnawaz Ahmed, Carlos Sánchez Muñoz, Franco Nori +1

Quantum state tomography (QST) is a challenging task in intermediate-scale quantum devices. Here, we apply conditional generative adversarial networks (CGANs) to QST. In the CGAN f…

quant-ph2020★ 26 cited

Squeezed lasing

Carlos Sánchez Muñoz, Dieter Jaksch

We introduce the concept of a squeezed laser, in which a squeezed cavity mode develops a macroscopic photonic occupation due to stimulated emission. Above the lasing threshold, the…

quant-ph2020★ 122 cited

Few-mode Field Quantization of Arbitrary Electromagnetic Spectral Densities

Ivan Medina, Francisco J. García-Vidal, Antonio I. Fernández-Domínguez +1

We develop a framework that provides a few-mode master equation description of the interaction between a single quantum emitter and an arbitrary electromagnetic environment. The fi…

quant-ph2020★ 3 cited

Lagrangian description of Heisenberg and Landau-von Neumann equations of motion

Florio M. Ciaglia, Fabio Di Cosmo, Alberto Ibort +3

An explicit Lagrangian description is given for the Heisenberg equation on the algebra of operators of a quantum system, and for the Landau-von Neumann equation on the manifold of…

quant-ph2020★ 26 cited

Reconfigurable photon sources based on quantum plexcitonic systems

Jia-Bin You, Xiao Xiong, Ping Bai +9

A single photon in a strongly nonlinear cavity is able to block the transmission of the second photon, thereby converting incident coherent light into anti-bunched light, which is…

quant-ph2020★ 12 cited

Revisiting the experimental test of Mermin's inequalities at IBMQ

Diego González, Diego Fernández de la Pradilla, Guillermo González

Bell-type inequalities allow for experimental testing of local hidden variable theories. In the present work we show the violation of Mermin's inequalities in IBM's five-qubit quan…

quant-ph2020★ 8 cited

The Prime state and its quantum relatives

D. García-Martín, E. Ribas, S. Carrazza +2

The Prime state of qubits, , is defined as the uniform superposition of all the computational-basis states corresponding to prime numbers smaller than $2^…

quant-ph2020★ 16 cited

Schwinger's Picture of Quantum Mechanics IV: Composition and independence

Florio M. Ciaglia, Fabio Di Cosmo, Alberto Ibort +1

The groupoids description of Schwinger's picture of quantum mechanics is continued by discussing the closely related notions of composition of systems, subsystems, and their indepe…

quant-ph2020★ 36 cited

Tuning photon statistics with coherent fields

Eduardo Zubizarreta Casalengua, Juan Camilo López Carreño, Fabrice P. Laussy +1

Photon correlations, as measured by Glauber's -th order coherence functions , are highly sought to be minimized and/or maximized. In systems that are coherently driven,…

quant-ph2020★ 36 cited

Efficient description of many-body systems with Matrix Product Density Operators

Jiri Guth Jarkovsky, Andras Molnar, Norbert Schuch +1

Matrix Product States form the basis of powerful simulation methods for ground state problems in one dimension. Their power stems from the fact that they faithfully approximate sta…

quant-ph2020★ 13 cited

Inaccessible entanglement in symmetry protected topological phases

Caroline de Groot, David T. Stephen, Andras Molnar +1

We study the entanglement structure of symmetry-protected topological (SPT) phases from an operational point of view by considering entanglement distillation in the presence of sym…