output
19922026
Showing 2014 · quant-phShow all

29 papers · 2 filters

quant-ph2014★ 2 cited

Extremal states for photon number and quadratures as gauges for nonclassicality

Z. Hradil, J. Rehacek, P. de la Hoz +2

Rotated quadratures carry the phase-dependent information of the electromagnetic field, so they are somehow conjugate to the photon number. We analyze this noncanonical pair, findi…

quant-ph2014★ 2 cited

Practical implementation of mutually unbiased bases using quantum circuits

U. Seyfarth, L. L. Sanchez-Soto, G. Leuchs

The number of measurements necessary to perform the quantum state reconstruction of a system of qubits grows exponentially with the number of constituents, creating a major obstacl…

quant-ph2014★ 7 cited

Sampling quantum nonlocal correlations with high probability

Carlos E. González-Guillén, C. Hugo Jiménez, Carlos Palazuelos +1

It is well known that quantum correlations for bipartite dichotomic measurements are those of the form , where the vectors and are…

quant-ph2014★ 27 cited

Nonclassicality Phase-Space Functions: More Insight with Fewer Detectors

A. Luis, J. Sperling, W. Vogel

Systems of on-off detectors are well established for measuring radiation fields in the regime of small photon numbers. We propose to combine these detector systems with unbalanced…

quant-ph2014★ 7 cited

Generation of entangled matter qubits in two opposing parabolic mirrors

N. Trautmann, J. Z. Bernád, M. Sondermann +3

We propose a scheme for the remote preparation of entangled matter qubits in free space. For this purpose, a setup of two opposing parabolic mirrors is considered, each one with a…

quant-ph2014★ 19 cited

Unpolarized states and hidden polarization

P. de la Hoz, G. Bjork, A. B. Klimov +2

We capitalize on a multipolar expansion of the polarisation density matrix, in which multipoles appear as successive moments of the Stokes variables. When all the multipoles up to…

quant-ph2014★ 19 cited

Rapid mixing and stability of quantum dissipative systems

Angelo Lucia, Toby S. Cubitt, Spyridon Michalakis +1

The physics of many materials is modeled by quantum many-body systems with local interactions. If the model of the system is sensitive to noise from the environment, or small pertu…

quant-ph2014★ 16 cited

Quantifying Spatial Correlations of General Quantum Dynamics

Ángel Rivas, Markus Müller

Understanding the role of correlations in quantum systems is both a fundamental challenge as well as of high practical relevance for the control of multi-particle quantum systems.…

quant-ph2014★ 103 cited

Unbounded number of channel uses are required to see quantum capacity

Toby Cubitt, David Elkouss, William Matthews +3

Transmitting data reliably over noisy communication channels is one of the most important applications of information theory, and well understood when the channel is accurately mod…

quant-ph2014★ 11 cited

Classical distinguishability as an operational measure of polarization

G. Bjork, H. de Guise, A. B. Klimov +2

We put forward an operational degree of polarization that can be extended in a natural way to fields whose wave fronts are not necessarily planar. This measure appears as a distanc…

quant-ph2014★ 14 cited

Efficient algorithm for optimizing data pattern tomography

L. Motka, B. Stoklasa, J. Rehacek +6

We give a detailed account of an efficient search algorithm for the data pattern tomography proposed by J. Rehacek, D. Mogilevtsev, and Z. Hradil [Phys. Rev. Lett.~\textbf{105}, 01…

quant-ph2014★ 26 cited

Time-Multiplexed Measurements of Nonclassical Light at Telecom Wavelengths

G. Harder, C. Silberhorn, J. Rehacek +4

We report the experimental reconstruction of the statistical properties of an ultrafast pulsed type-II parametric down conversion source in a periodically poled KTP waveguide at te…

quant-ph2014★ 24 cited

Quantum phase transitions of atom-molecule Bose mixtures in a double-well potential

Armando Relaño, Jorge Dukelsky, Pedro Perez-Fernandez +1

The ground state and spectral properties of Bose gases in double-well potentials are studied in two different scenarios: i) an interacting atomic Bose gas, and ii) a mixture of an…

quant-ph2014★ 78 cited

High Bit Rate Continuous-Variable Quantum Key Distribution

Paul Jouguet, David Elkouss, Sébastien Kunz-Jacques

Here, we demonstrate that a practical Continuous Variables Quantum Key Distribution (CVQKD) protocol relying on the Gaussian modulation of coherent states features secret key rates…

quant-ph2014

Invisibility and PT Symmetry: A Simple Geometrical Viewpoint

Luis L. Sanchez-Soto, Juan J. Monzon

We give a simplified account of the properties of the transfer matrix for a complex one-dimensional potential, paying special attention to the particular instance of unidirectional…

quant-ph2014★ 13 cited

Plasmon-assisted quantum control of distant emitters

C. E. Susa, J. H. Reina, R. Hildner

We show how to generate and control the correlations in a set of two distant quantum emitters coupled to a one-dimensional dissipative plasmonic waveguide. An external laser field…

quant-ph2014★ 1k cited

Quantum Non-Markovianity: Characterization, Quantification and Detection

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

We present a comprehensive and up to date review on the concept of quantum non-Markovianity, a central theme in the theory of open quantum systems. We introduce the concept of quan…

quant-ph2014★ 9 cited

Structure of the sets of mutually unbiased bases with cyclic symmetry

Ulrich Seyfarth, Luis L. Sanchez-Soto, Gerd Leuchs

Mutually unbiased bases that can be cyclically generated by a single unitary operator are of special interest, since they can be readily implemented in practice. We show that, for…

quant-ph2014★ 40 cited

Irreversible processes without energy dissipation in an isolated Lipkin-Meshkov-Glick model

Ricardo Puebla, Armando Relaño

For a certain class of isolated quantum systems, we report the existence of irreversible processes in which the energy is not dissipated. After a closed cycle in which the initial…

quant-ph2014★ 413 cited

Experimental Quantum Computations on a Topologically Encoded Qubit

Daniel Nigg, Markus Mueller, Esteban A. Martinez +5

The construction of a quantum computer remains a fundamental scientific and technological challenge, in particular due to unavoidable noise. Quantum states and operations can be pr…

quant-ph2014★ 19 cited

Quantum reconstruction of the mutual coherence function

Z. Hradil, J. Rehacek, L. L. Sanchez-Soto

Light is a major carrier of information about the world around us, from the microcosmos to the macrocosmos. The present methods of detection are sensitive both to robust features,…

quant-ph2014★ 80 cited

Wavefront sensing reveals optical coherence

B. Stoklasa, L. Motka, J. Rehacek +2

Wavefront sensing is a set of techniques providing efficient means to ascertain the shape of an optical wavefront or its deviation from an ideal reference. Due to its wide dynamica…

quant-ph2014★ 37 cited

Inducing Non-Classical Lasing Via Periodic Drivings in Circuit Quantum Electrodynamics

Carlos Navarrete-Benlloch, Juan José García-Ripoll, Diego Porras

We show how a pair of superconducting qubits coupled to a microwave cavity mode can be used to engineer a single-atom laser that emits light into a non-classical state. Our scheme…

quant-ph2014

Spin state in the propagation of quantum relativistic particles along classical trajectories

Jesús Rubio, Alfredo Luis

We address the propagation of the spin along classical trajectories for a 1/2-spin particle obeying the Dirac equation with scalar potentials. Focusing on classical trajectories as…