Quantum Physics

Phononic crystal diffraction gratings

Rayisa P. Moiseyenko, Sarah Herbison, Nico F. Declercq, and Vincent Laude
When a phononic crystal is interrogated by an external source of acoustic waves, there is necessarily a phenomenon of diffraction occurring on the external enclosing surfaces. Indeed, these external surfaces are periodic and the resulting acoustic diffraction grating has a periodicity that depends o ... [J. Appl. Phys. 111, 034907 (2012)] published Fri Feb 10, 2012.

The coincidence limit of the graviton propagator in de Donder gauge on de Sitter background

E. O. Kahya, S. P. Miao, and R. P. Woodard
We explicitly work out the de Sitter breaking contributions to the recent solution for the de Donder gauge graviton propagator on de Sitter. We also provide explicit power series expansions for the two structure functions, which are suitable for implementing dimensional regularization. And we evalua ... [J. Math. Phys. 53, 022304 (2012)] published Fri Feb 10, 2012.

Metal-to-Insulator Transition and Electron-Hole Puddle Formation in Disordered Graphene Nanoribbons

Gerald Schubert and Holger Fehske
The experimentally observed metal-to-insulator transition in hydrogenated graphene is numerically confirmed for actual sized graphene samples and realistic impurity concentrations. The eigenstates of our tight-binding model with substitutional disorder corroborate the formation of electron-hole pudd ... [Phys. Rev. Lett. 108, 066402 ] published .

Erratum: Bell's theorem with and without inequalities for the three-qubit Greenberger-Horne-Zeilinger and W states [Phys. Rev. A 65, 032108 (2002)]

Adan Cabello
Abstract not available. [Phys. Rev. A 85, 029903 ] published .

Quantum theory analysis of triple photons generated by a chi process

A. Dot, A. Borne, B. Boulanger, K. Bencheikh, and J. A. Levenson
We present a quantum theoretical analysis of triple photons generated by a phase-matched third-order nonlinear process in a KTP crystal in a weak-interaction regime. We show that the quantum properties of the triple photons can be brought to light through optical second- and third-order sum frequenc ... [Phys. Rev. A 85, 023809 ] published .

Manifestation of quantum disordered wave functions with weak localization from conical second harmonic generation in ferroelectric crystal

H. H. Yu, H. J. Zhang, Z. P. Wang, H. H. Xu, Y. C. Wang et al.
The spatial structure of two-dimensional quantum disordered wave functions with weak localization (WL) is experimentally observed using a calcium barium niobate CaBaNbO (CBN-28) ferroelectric crystal illuminated by a pulsed laser beam. Non-collinear phase-matching in CBN-28 produces conical second h ... [Appl. Phys. Lett. 100, 061119 (2012)] published Thu Feb 9, 2012.

Realizing the Multiparticle Hanbury BrownTwiss Interferometer Using Nitrogen-Vacancy Centers in Diamond Crystals

Li Dai and L. C. Kwek
We demonstrate that the multiparticle Hanbury BrownTwiss interferometer can be realized in a network of nitrogen-vacancy centers: for an N-particle system, the interference effect is manifested only in the Nth-order intensity correlation function. The interference effect can be enhanced through a po ... [Phys. Rev. Lett. 108, 066803 ] published .

Complete Set of Operational Measures for the Characterization of Three-Qubit Entanglement

J. I. de Vicente, T. Carle, C. Streitberger, and B. Kraus
We characterize the entanglement contained in a pure three-qubit state via operational entanglement measures. To this end, we derive a new decomposition for arbitrary three-qubit states which is characterized by five parameters (up to local unitary operations). We show that these parameters are uniq ... [Phys. Rev. Lett. 108, 060501 ] published .

Thermodynamics of ideal gas in doubly special relativity

Nitin Chandra and Sandeep Chatterjee
We study thermodynamics of an ideal gas in doubly special relativity. A new type of special functions (which we call incomplete modified Bessel functions) emerge. We obtain a series solution for the partition function and derive thermodynamic quantities. We observe that doubly special relativity the ... [Phys. Rev. D 85, 045012 ] published .

Decoherence-induced conductivity in the discrete one-dimensional Anderson model: A novel approach to even-order generalized Lyapunov exponents

Matias Zilly, Orsolya Ujsaghy, Marko Woelki, and Dietrich E. Wolf
A recently proposed statistical model for the effects of decoherence on electron transport manifests a decoherence-driven transition from quantum-coherent localized to Ohmic behavior when applied to the one-dimensional Anderson model. Here we derive the resistivity in the Ohmic case and show that th ... [Phys. Rev. B 85, 075110 ] published .

Influence of Coulomb interaction on the Aharonov-Bohm effect in an electronic Fabry-Perot interferometer

Stephane Ngo Dinh and Dmitry A. Bagrets
We study the role of Coulomb interaction in an electronic Fabry-Perot interferometer (FPI) realized with chiral edge states in the integer quantum Hall regime in the limit of weak backscattering. Assuming that a compressible Coulomb island in a bulk region of the FPI is formed, we develop a capacita ... [Phys. Rev. B 85, 073403 ] published .

Overcoming decoherence in the collapse and revival of spin Schrodinger-cat states

M. J. Everitt, W. J. Munro, and T. P. Spiller
In addition to being a very interesting quantum phenomenon, Schrodinger-cat-state swapping has the potential for application in the preparation of quantum states that could be used in metrology and other quantum processing. We study in detail the effects of field decoherence on a Schrodinger-cat-sta ... [Phys. Rev. A 85, 022113 ] published .

Correlations in optically controlled quantum emitters

Cristian E. Susa and John H. Reina
We address the problem of optically controlling and quantifying the dissipative dynamics of quantum and classical correlations in a setup of individual quantum emitters under external laser excitation. We show that both types of correlations, the former measured by the quantum discord, are present i ... [Phys. Rev. A 85, 022111 ] published .

Field theoretic approach to roughness corrections

Hua Yao Wu and Martin Schaden
We develop a systematic field theoretic description of roughness corrections to the Casimir free energy of a massless scalar field in the presence of parallel plates with mean separation a. Roughness is modeled by specifying a generating functional for correlation functions of the height profile. Th ... [Phys. Rev. D 85, 045008 ] published .

Contrasting features of anisotropic loop quantum cosmologies: The role of spatial curvature

Brajesh Gupt and Parampreet Singh
A characteristic feature of loop quantization of the isotropic and Bianchi-I spacetimes is the existence of universal bounds on the energy density and the expansion and shear scalars, independent of the matter content. We investigate the properties of these physical quantities in Bianchi-II and Bian ... [Phys. Rev. D 85, 044011 ] published .

Pion wave functions from holographic QCD and the role of infrared renormalons in photon-photon collisions

A. I. Ahmadov, C. Aydin, and F. Keskin
In this article, we calculate the contribution of the higher-twist Feynman diagrams to the large-p inclusive single pion production cross section in photon-photon collisions in case of the running coupling and frozen coupling approaches within holographic QCD. We compare the resummed higher-twist cr ... [Phys. Rev. D 85, 034009 ] published .

Flavor SU(4) breaking between effective couplings

Bruno El-Bennich, Gastao Krein, Lei Chang, Craig D. Roberts, and David J. Wilson
Using a framework in which all elements are constrained by Dyson-Schwinger equation studies in QCD, and therefore incorporate a consistent, direct and simultaneous description of light- and heavy-quarks and the states they constitute, we analyze the accuracy of SU(4)-flavor symmetry relations betwee ... [Phys. Rev. D 85, 031502 ] published .

Ground-state degeneracy in the Levin-Wen model for topological phases

Yuting Hu, Spencer D. Stirling, and Yong-Shi Wu
We study the properties of topological phases by calculating the ground-state degeneracy (GSD) of the two-dimensional Levin-Wen (LW) model. Here it is explicitly shown that the GSD depends only on the spatial topology of the system. Then we show that the ground state on a sphere is always nondegener ... [Phys. Rev. B 85, 075107 ] published .

Shear modulus of an elastic solid under external pressure as a function of temperature: The case of helium

Felipe Barra, Fernando Lund, Nicolas Mujica, and Sergio Rica
The energy of a dislocation loop in a continuum elastic solid under pressure is considered within the framework of classical mechanics. For a circular loop, this is a function with a maximum at pressures that are well within reach of experimental conditions for solid helium, suggesting, in this case ... [Phys. Rev. B 85, 064103 ] published .

Back-reaction effects of quantum vacuum in cavity quantum electrodynamics

I. Carusotto, S. De Liberato, D. Gerace, and C. Ciuti
We theoretically study an optical system in which the back-reaction of quantum vacuum manifests itself as a sizable suppression of the absorption by a three-level emitter embedded in an optical cavity. A theoretical model including the anti-rotating-wave terms of the light-matter interaction Hamilto ... [Phys. Rev. A 85, 023805 ] published .

Number-phase Wigner representation for scalable stochastic simulations of controlled quantum systems

M. R. Hush, A. R. R. Carvalho, and J. J. Hope
Simulation of conditional master equations is important to describe systems under continuous measurement and for the design of control strategies in quantum systems. For large bosonic systems, such as Bose-Einstein condensates and atom lasers, full quantum-field simulations must rely on scalable sto ... [Phys. Rev. A 85, 023607 ] published .

Interacting classical and quantum particles

Alvin J. K. Chua, Michael J. W. Hall, and C. M. Savage
We apply Hall and Reginatto's theory of interacting classical and quantum ensembles to harmonically coupled particles, with a view to understanding its experimental implications. This hybrid theory has no free parameters and makes distinctive predictions that should allow it to be experimentally dis ... [Phys. Rev. A 85, 022110 ] published .

NMR implementation of a quantum delayed-choice experiment

Soumya Singha Roy, Abhishek Shukla, and T. S. Mahesh
We report an experimental demonstration of a quantum delayed-choice experiment via nuclear magnetic resonance techniques. Two spin-1/2 nuclei from each molecule of a liquid ensemble are used as target and ancilla qubits. The circuit corresponding to the recently proposed quantum delayed-choice setup ... [Phys. Rev. A 85, 022109 ] published .

Local-channel-induced rise of quantum correlations in continuous-variable systems

Francesco Ciccarello and Vittorio Giovannetti
It was recently discovered that the quantum correlations of a pair of disentangled qubits, as measured by the quantum discord, can increase solely because of their interaction with a local dissipative bath. Here, we show that a similar phenomenon can occur in continuous-variable bipartite systems. W ... [Phys. Rev. A 85, 022108 ] published .

Triviality problem and high-temperature expansions of higher susceptibilities for the Ising and scalar-field models in four-, five-, and six-dimensional lattices

P. Butera and M. Pernici
High-temperature expansions are presently the only viable approach to the numerical calculation of the higher susceptibilities for the spin and the scalar-field models on high-dimensional lattices. The critical amplitudes of these quantities enter into a sequence of universal amplitude ratios that d ... [Phys. Rev. E 85, 021105 ] published .

Multiverse interpretation of quantum mechanics

Raphael Bousso and Leonard Susskind
We argue that the many worlds of quantum mechanics and the many worlds of the multiverse are the same thing, and that the multiverse is necessary to give exact operational meaning to probabilistic predictions from quantum mechanics. Decoherencethe modern version of wave-function collapseis subjectiv ... [Phys. Rev. D 85, 045007 ] published .

Resonant modulational instability and self-induced transmission effects in semiconductors: Maxwell-Bloch formalism

Oleksii A. Smyrnov and Fabio Biancalana
The nonlinear optical properties of semiconductors near an excitonic resonance are investigated theoretically by using the macroscopic J model [Ostreich and Knorr, Phys. Rev. B 48, 17811 (1993); and ibid. 50, 5717 (1994)] based on the microscopic semiconductor Bloch equations. These nonlinear prop ... [Phys. Rev. B 85, 075201 ] published .

Observers can always generate nonlocal correlations without aligning measurements by covering all their bases

Joel J. Wallman and Stephen D. Bartlett
Quantum theory allows for correlations between the outcomes of distant measurements that are inconsistent with any locally causal model, as demonstrated by the violation of a Bell inequality. Typical demonstrations of these correlations require careful alignment between the measurements, which requi ... [Phys. Rev. A 85, 024101 ] published .

Low-rank positive-partial-transpose states and their relation to product vectors

Leif Ove Hansen, Andreas Hauge, Jan Myrheim, and Per Oyvind Sollid
Deciding whether a mixed quantum state is separable or entangled is a difficult problem in general. Separable states are positive under partial transposition [they are positive-partial-transpose (PPT) states], but this simple test does not exclude all entangled states. In order to understand the ent ... [Phys. Rev. A 85, 022309 ] published .

Relation between wave-particle duality and quantum uncertainty

Hong-Yu Liu, Jie-Hui Huang, Jiang-Rui Gao, M. Suhail Zubairy, and Shi-Yao Zhu
We present a study of the relation between wave-particle duality and quantum uncertainty in a two-path interferometer and derive equalities and inequalities involving the visibility (representing wave-like behavior), the predictability (representing particle-like behavior), and their variances. We e ... [Phys. Rev. A 85, 022106 ] published .

Linearly polarized gluon distributions in the color dipole model

Fabio Dominguez, Jian-Wei Qiu, Bo-Wen Xiao, and Feng Yuan
We show that the linearly polarized gluon distributions appear in the color dipole model as we derive the full cross sections of the DIS dijet production and the Drell-Yan dijet (gamma jet correlation) process. Together with the normal Weizsacker-Williams gluon distribution, the linearly polarized o ... [Phys. Rev. D 85, 045003 ] published .

Electromagnetically superconducting phase of the vacuum in a strong magnetic field: Structure of superconductor and superfluid vortex lattices in the ground state

M. N. Chernodub, Jos Van Doorsselaere, and Henri Verschelde
Recently it was shown that vacuum in a background of a strong enough magnetic field becomes an electromagnetic superconductor due to interplay between strong and electromagnetic forces. The superconducting ground state of the vacuum is associated with a spontaneous emergence of quark-antiquark conde ... [Phys. Rev. D 85, 045002 ] published .

Bounding bubbles: The vertex representation of 3d group field theory and the suppression of pseudomanifolds

Sylvain Carrozza and Daniele Oriti
Based on recent work on simplicial diffeomorphisms in colored group field theories, we develop a representation of the colored Boulatov model, in which the group field theory (GFT) fields depend on variables associated to vertices of the associated simplicial complex, as opposed to edges. On top of ... [Phys. Rev. D 85, 044004 ] published .

Group field theory and simplicial gravity path integrals: A model for Holst-Plebanski gravity

Aristide Baratin and Daniele Oriti
In a recent work, a dual formulation of group field theories as noncommutative quantum field theories has been proposed, providing an exact duality between spin foam models and noncommutative simplicial path integrals for constrained BF theories. In light of this new framework, we define a model for ... [Phys. Rev. D 85, 044003 ] published .

Back-action of a driven nonlinear resonator on a superconducting qubit

Maxime Boissonneault, A. C. Doherty, F. R. Ong, P. Bertet, D. Vion et al.
We study the backaction of a driven nonlinear resonator on a multilevel superconducting qubit. Using unitary transformations on the multilevel Jaynes-Cummings Hamiltonian and quantum optics master equation, we derive an analytical model that goes beyond linear response theory. Within the limits of v ... [Phys. Rev. A 85, 022305 ] published .

Dynamical Gaussian state transfer with quantum-error-correcting architecture

Go Tajimi and Naoki Yamamoto
Transferring a quantum state of a light field to a memory is of particular importance. However, this transfer is usually hampered because the memory system is subjected to some noise and this can limit the performance of the state transfer greatly. In this paper, we consider the transfer of a Gaussi ... [Phys. Rev. A 85, 022303 ] published .

Boundary contributions to the hypervirial theorem

J. G. Esteve, F. Falceto, and Pulak Ranjan Giri
It is shown that, under certain boundary conditions, the virial theorem has to be modified. We analyze the origin of the extra term and compute it for particular examples. The Coulomb and harmonic oscillator with the point interaction have been studied in light of this generalization of the virial t ... [Phys. Rev. A 85, 022104 ] published .

Coherent, mechanical control of a single electronic spin. (arXiv:1202.1823v1 [cond-mat.mes-hall])

ePrint arXiv http://arXiv.org/

Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits. (arXiv:1202.1828v1 [cond-mat.mes-hall])

ePrint arXiv http://arXiv.org/

Strong resilience of topological codes to depolarization. (arXiv:1202.1852v1 [quant-ph])

ePrint arXiv http://arXiv.org/

Simple Quantum Model of Learning Explains the Yerkes-Dodson Law in Psychology. (arXiv:1202.1893v1 [physics.soc-ph])

ePrint arXiv http://arXiv.org/

Relation Between Quantum Speed Limits And Metrics On U(n). (arXiv:1202.1899v1 [quant-ph])

ePrint arXiv http://arXiv.org/

Slowing light with a coupled optomechanical crystal array. (arXiv:1202.1900v1 [quant-ph])

ePrint arXiv http://arXiv.org/

Atomic physics and quantum optics using superconducting circuits. (arXiv:1202.1923v1 [quant-ph])

ePrint arXiv http://arXiv.org/

Fixed energy potentials through an auxiliary inverse eigenvalue problem. (arXiv:1202.1931v1 [math-ph])

ePrint arXiv http://arXiv.org/

Exact diagonalization of the one dimensional Bose-Hubbard model with local 3-body interactions. (arXiv:1202.1932v1 [cond-mat.str-el])

ePrint arXiv http://arXiv.org/

Entanglement in a three spin system controlled by electric and magnetic field. (arXiv:1202.1947v1 [cond-mat.mes-hall])

ePrint arXiv http://arXiv.org/

Correlations in quantum states and the local creation of quantum discord. (arXiv:1202.1959v1 [quant-ph])

ePrint arXiv http://arXiv.org/

Spatial mode effects in a cavity EIT-based quantum memory with ion Coulomb crystals. (arXiv:1202.1963v1 [quant-ph])

ePrint arXiv http://arXiv.org/