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Showing 2011 · quant-phShow all

32 papers · 2 filters

quant-ph2011★ 7 cited

Angular-momentum nonclassicality by breaking classical bounds on statistics

Alfredo Luis, Ángel Rivas

We derive simple practical procedures revealing the quantum behavior of angular momentum variables by the violation of classical upper bounds on the statistics. Data analysis is mi…

quant-ph2011★ 4 cited

Rank-one Quantum Games

T. Cooney, M. Junge, C. Palazuelos +1

In this work we study rank-one quantum games. In particular, we focus on the study of the computability of the entangled value . We show that the value can be efficientl…

quant-ph2011★ 115 cited

Google in a Quantum Network

G. D. Paparo, M. A. Martin-Delgado

We introduce the characterization of a class of quantum PageRank algorithms in a scenario in which some kind of quantum network is realizable out of the current classical internet…

quant-ph2011★ 8 cited

A constructive commutative quantum Lovasz Local Lemma, and beyond

Toby S. Cubitt, Martin Schwarz

The recently proven Quantum Lovasz Local Lemma generalises the well-known Lovasz Local Lemma. It states that, if a collection of subspace constraints are "weakly dependent", there…

quant-ph2011★ 20 cited

Generalized Toric Codes Coupled to Thermal Baths

O. Viyuela, A. Rivas, M. A. Martin-Delgado

We have studied the dynamics of a generalized toric code based on qudits at finite temperature by finding the master equation coupling the code's degrees of freedom to a thermal ba…

quant-ph2011★ 25 cited

Gapless Hamiltonians for the toric code using the PEPS formalism

Carlos Fernández-González, Norbert Schuch, Michael M. Wolf +2

We study Hamiltonians which have Kitaev's toric code as a ground state, and show how to construct a Hamiltonian which shares the ground space of the toric code, but which has gaple…

quant-ph2011★ 18 cited

Are problems in Quantum Information Theory (un)decidable?

Michael M. Wolf, Toby S. Cubitt, David Perez-Garcia

This note is intended to foster a discussion about the extent to which typical problems arising in quantum information theory are algorithmically decidable (in principle rather tha…

quant-ph2011★ 10 cited

Feynman Diagrams for Dispersion Interactions Out of Equilibrium -- Two-Body Potentials for Atoms with Initial Excitation

Harald R. Haakh, Jürgen Schiefele, Carsten Henkel

Diagrammatic techniques are well-known in the calculation of dispersion interactions between atoms or molecules. The multipolar coupling scheme combined with Feynman ordered diagra…

quant-ph2011

Central-moment description of polarization for quantum states of light

G. Björk, J. Söderholm, Y. -S. Kim +6

We present a moment expansion method for the systematic characterization of the polarization properties of quantum states of light. Specifically, we link the method to the measurem…

quant-ph2011★ 3 cited

Entanglement and the three-dimensionality of the Bloch ball

Lluis Masanes, Markus P. Mueller, David Perez-Garcia +1

We consider a very natural generalization of quantum theory by letting the dimension of the Bloch ball be not necessarily three. We analyze bipartite state spaces where each of the…

quant-ph2011★ 4 cited

Stochastic Quantization and Casimir Forces

Pablo Rodriguez-Lopez, Ricardo Brito, Rodrigo Soto

In this paper we show how the stochastic quantization method developed by Parisi and Wu can be used to obtain Casimir forces. Both quantum and thermal fluctuations are taken into a…

quant-ph2011★ 4 cited

Testing microscopic discretization

Miguel Navascues, David Perez-Garcia, Ignacio Villanueva

What can we say about the spectra of a collection of microscopic variables when only their coarse-grained sums are experimentally accessible? In this paper, using the tools and met…

quant-ph2011★ 6 cited

Entanglement can completely defeat quantum noise

Jianxin Chen, Toby S. Cubitt, Aram W. Harrow +1

We describe two quantum channels that individually cannot send any information, even classical, without some chance of decoding error. But together a single use of each channel can…

quant-ph2011

On Quantum Effects in a Theory of Biological Evolution

M. A. Martin-Delgado

We construct a descriptive toy model that considers quantum effects on biological evolution starting from Chaitin's classical framework. There are smart evolution scenarios in whic…

quant-ph2011★ 24 cited

Simulating accelerated atoms coupled to a quantum field

M. del Rey, D. Porras, E. Martin-Martinez

We show an analogy between static quantum emitters coupled to a single mode of a quantum field and accelerated Unruh-DeWitt detectors. We envision a way to simulate a variety of re…

quant-ph2011★ 2 cited

Projective Representations of the Inhomogeneous Hamilton Group: Noninertial Symmetry in Quantum Mechanics

S. G. Low, P. D. Jarvis, R. Campoamor-Stursberg

Symmetries in quantum mechanics are realized by the projective representations of the Lie group as physical states are defined only up to a phase. A cornerstone theorem shows that…

quant-ph2011★ 26 cited

Spatial Pauli-blocking of spontaneous emission in optical lattices

R. M. Sandner, M. Müller, A. J. Daley +1

Spontaneous emission by an excited fermionic atom can be suppressed due to the Pauli exclusion principle if the relevant final states after the decay are already occupied by identi…

quant-ph2011★ 45 cited

Shaping an Itinerant Quantum Field by Dissipation

Diego Porras, Juan José García-Ripoll

We show that inducing sidebands in the emission of a single emitter into a one dimensional waveguide, together with a dissipative re-pumping process, a photon field is cooled down…

quant-ph2011★ 204 cited

Non-Markovianity assisted Steady State Entanglement

Susana F. Huelga, Ángel Rivas, Martin B. Plenio

We analyze the steady state entanglement generated in a coherently coupled dimer system subject to dephasing noise as a function of the degree of Markovianity of the evolution. By…

quant-ph2011★ 45 cited

A physical approach to Tsirelson's problem

Miguel Navascues, Tom Cooney, David Perez-Garcia +1

Tsirelson's problem deals with how to model separate measurements in quantum mechanics. In addition to its theoretical importance, the resolution of Tsirelson's problem could have…

quant-ph2011★ 55 cited

Sub-Heisenberg estimation of non-random phase-shifts

Ángel Rivas, Alfredo Luis

We provide evidence that the uncertainty in detection of small and deterministic phase-shift deviations from a working point can be lower than the Heisenberg bound, for fixed finit…

quant-ph2011

An All-But-One Entropic Uncertainty Relation, and Application to Password-based Identification

Niek J. Bouman, Serge Fehr, Carlos González-Guillén +1

Entropic uncertainty relations are quantitative characterizations of Heisenberg's uncertainty principle, which make use of an entropy measure to quantify uncertainty. In quantum cr…

quant-ph2011★ 32 cited

Quantum algorithms for classical lattice models

G. De las Cuevas, W. Dür, M. Van den Nest +1

We give efficient quantum algorithms to estimate the partition function of (i) the six vertex model on a two-dimensional (2D) square lattice, (ii) the Ising model with magnetic fie…

quant-ph2011★ 127 cited

Simulating open quantum systems: from many-body interactions to stabilizer pumping

M. Mueller, K. Hammerer, Y. L. Zhou +2

In a recent experiment, Barreiro et al. demonstrated the fundamental building blocks of an open-system quantum simulator with trapped ions [Nature 470, 486 (2011)]. Using up to fiv…