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Showing 2014 · quant-phShow all

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quant-ph2014★ 9 cited

Implications of a deeper level explanation of the deBroglie-Bohm version of quantum mechanics

Gerhard Groessing, Siegfried Fussy, Johannes Mesa Pascasio +1

Elements of a "deeper level" explanation of the deBroglie-Bohm (dBB) version of quantum mechanics are presented. Our explanation is based on an analogy of quantum wave-particle dua…

quant-ph2014★ 29 cited

Long Distance Coupling of a Quantum Mechanical Oscillator to the Internal States of an Atomic Ensemble

B. Vogell, T. Kampschulte, M. T. Rakher +4

We propose and investigate a hybrid optomechanical system consisting of a micro-mechanical oscillator coupled to the internal states of a distant ensemble of atoms. The interaction…

quant-ph2014★ 311 cited

Experimental Superposition of Orders of Quantum Gates

Lorenzo M. Procopio, Amir Moqanaki, Mateus Araújo +7

In a quantum computer, creating superpositions of quantum bits (qubits) in different states can lead to a speed-up over classical computers [1], but quantum mechanics also allows f…

quant-ph2014★ 18 cited

Weak-value amplification of the fast-light effect in rubidium vapor

Mohammad Mirhosseini, Gerardo Viza, Omar S. Magaña-Loaiza +3

We use weak-value amplification to enhance the polarization-sensitive fast-light effect from induced Raman absorption in hot rubidium vapor. We experimentally demonstrate that proj…

quant-ph2014★ 14 cited

The complex and quaternionic quantum bit from relativity of simultaneity on an interferometer

Andrew J. P. Garner, Markus P. Müller, Oscar C. O. Dahlsten

The patterns of fringes produced by an interferometer have long been important testbeds for our best contemporary theories of physics. Historically, interference has been used to c…

quant-ph2014★ 29 cited

Strong Single-Photon Coupling in Superconducting Quantum Magnetomechanics

Guillem Via, Gerhard Kirchmair, Oriol Romero-Isart

We show that the inductive coupling between the quantum mechanical motion of a superconducting microcantilever and a flux-dependent microwave quantum circuit can attain the strong…

quant-ph2014★ 42 cited

Steering maps and their application to dimension-bounded steering

Tobias Moroder, Oleg Gittsovich, Marcus Huber +2

The existence of quantum correlations that allow one party to steer the quantum state of another party is a counterintuitive quantum effect that has been described already at the b…

quant-ph2014★ 62 cited

Characterizing multipartite entanglement without shared reference frames

Claude Klöckl, Marcus Huber

Multipartite entanglement constitutes one of the key resources in quantum information processing. We exploit correlation tensor norms to develop a framework for its experimental de…

quant-ph2014★ 87 cited

Requirements for a loophole-free photonic Bell test using imperfect setting generators

Johannes Kofler, Marissa Giustina, Jan-Åke Larsson +1

Experimental violations of Bell inequalities are in general vulnerable to so-called "loopholes." In this work, we analyse the characteristics of a loophole-free Bell test with phot…

quant-ph2014★ 57 cited

Quantum entanglement from random measurements

Minh Cong Tran, Borivoje Dakic, Francois Arnault +2

We show that the expectation value of squared correlations measured along random local directions is an identifier of quantum entanglement in pure states which can be directly expe…

quant-ph2014★ 357 cited

Quantum Optics of Chiral Spin Networks

Hannes Pichler, Tomás Ramos, Andrew J. Daley +1

We study the driven-dissipative dynamics of a network of spin-1/2 systems coupled to one or more chiral 1D bosonic waveguides within the framework of a Markovian master equation. W…

quant-ph2014★ 285 cited

Divergence of an orbital-angular-momentum-carrying beam upon propagation

Miles J. Padgett, Filippo M. Miatto, Martin Lavery +2

There is recent interest in the use of light beams carrying orbital angular momentum (OAM) for creating multiple channels within free-space optical communication systems. One limit…

quant-ph2014★ 1 cited

Linear-optical generation of eigenstates of the two-site XY model

Stefanie Barz, Borivoje Dakic, Yannick Ole Lipp +3

Much of the anticipation accompanying the development of a quantum computer relates to its application to simulating dynamics of another quantum system of interest. Here we study t…

quant-ph2014★ 202 cited

Designing Frustrated Quantum Magnets with Laser-Dressed Rydberg Atoms

Alexander W. Glaetzle, Marcello Dalmonte, Rejish Nath +3

We show how a broad class of lattice spin-1/2 models with angular- and distance-dependent couplings can be realized with cold alkali atoms stored in optical or magnetic trap arrays…

quant-ph2014★ 411 cited

Ion-trap measurements of electric-field noise near surfaces

M. Brownnutt, M. Kumph, P. Rabl +1

Electric-field noise near surfaces is a common problem in diverse areas of physics, and a limiting factor for many precision measurements. There are multiple mechanisms by which su…

quant-ph2014★ 54 cited

A simple and robust method for characterization of afterpulsing in single photon detectors

Gerhard Humer, Momtchil Peev, Christoph Schaeff +3

Single photon detectors are important for a wide range of applications each with their own specific requirements, which makes necessary the precise characterization of detectors. H…

quant-ph2014★ 72 cited

The thermodynamics of creating correlations: Limitations and optimal protocols

David Edward Bruschi, Martí Perarnau-Llobet, Nicolai Friis +2

We establish a rigorous connection between fundamental resource theories at the quantum scale. Correlations and entanglement constitute indispensable resources for numerous quantum…

quant-ph2014★ 77 cited

Quantum estimation of the Schwarzschild space-time parameters of the Earth

David Edward Bruschi, Animesh Datta, Rupert Ursin +2

We propose a quantum experiment to measure with high precision the Schwarzschild space-time parameters of the Earth. The scheme can also be applied to measure distances by taking i…

quant-ph2014★ 123 cited

Enhanced Quantum Interface with Collective Ion-Cavity Coupling

B. Casabone, K. Friebe, B. Brandstätter +3

We prepare a maximally entangled state of two ions and couple both ions to the mode of an optical cavity. The phase of the entangled state determines the collective interaction of…

quant-ph2014★ 214 cited

Quantum Spin Dimers from Chiral Dissipation in Cold-Atom Chains

Tomás Ramos, Hannes Pichler, Andrew J. Daley +1

We consider the non-equilibrium dynamics of a driven dissipative spin chain with chiral coupling to a 1D bosonic bath, and its atomic implementation with a two-species mixture of c…

quant-ph2014★ 5 cited

Renormalized entropy of entanglement in relativistic field theory

Issam Ibnouhsein, Fabio Costa, Alexei Grinbaum

Entanglement is defined between subsystems of a quantum system, and at fixed time two regions of space can be viewed as two subsystems of a relativistic quantum field. The entropy…

quant-ph2014★ 128 cited

Two-dimensional Lattice Gauge Theories with Superconducting Quantum Circuits

D. Marcos, P. Widmer, E. Rico +4

A quantum simulator of U(1) lattice gauge theories can be implemented with superconducting circuits. This allows the investigation of confined and deconfined phases in quantum link…

quant-ph2014★ 32 cited

An On-Demand Optical Quantum Random Number Generator with In-Future Action and Ultra-Fast Response

Mario Stipčević, Rupert Ursin

Random numbers are essential for our modern information based society e.g. in cryptography. Unlike frequently used pseudo-random generators, physical random number generators do no…

quant-ph2014★ 229 cited

Delayed-choice gedanken experiments and their realizations

Xiao-song Ma, Johannes Kofler, Anton Zeilinger

The wave-particle duality dates back to Einstein's explanation of the photoelectric effect through quanta of light and de Broglie's hypothesis of matter waves. Quantum mechanics us…