Physics

Error-rejecting quantum computing with solid-state spins assisted by low-Q optical microcavities

PRA: Quantum information - Thu, 2016-12-08 17:00

Author(s): Tao Li (李涛) and Fu-Guo Deng (邓富国)

We present an efficient proposal for error-rejecting quantum computing with quantum dots (QDs) embedded in single-sided optical microcavities based on the interface between the circularly polarized photon and QDs. An almost unity fidelity of the quantum entangling gate (EG) can be implemented with a…


[Phys. Rev. A 94, 062310] Published Thu Dec 08, 2016

Categories: Journals, Physics

Quantum-information approach to dynamical diffraction theory

PRA: Quantum information - Thu, 2016-12-08 17:00

Author(s): J. Nsofini, K. Ghofrani, D. Sarenac, D. G. Cory, and D. A. Pushin

We present a simplified model for dynamical diffraction of particles through a periodic thick perfect crystal based on repeated application of a coherent beam-splitting unitary at coarse-grained lattice sites. By demanding translational invariance and a computationally tractable number of sites in t…


[Phys. Rev. A 94, 062311] Published Thu Dec 08, 2016

Categories: Journals, Physics

Transformation-optics simulation method for stimulated Brillouin scattering

Author(s): Roberto Zecca, Patrick T. Bowen, David R. Smith, and Stéphane Larouche

We develop an approach to enable the full-wave simulation of stimulated Brillouin scattering and related phenomena in a frequency-domain, finite-element environment. The method uses transformation-optics techniques to implement a time-harmonic coordinate transform that reconciles the different frame…


[Phys. Rev. A 94, 063818] Published Wed Dec 07, 2016

Categories: Journals, Physics

Synchronization of micromasers

Author(s): C. Davis-Tilley and A. D. Armour

We investigate synchronization effects in quantum self-sustained oscillators theoretically using the micromaser as a model system. We use the probability distribution for the relative phase as a tool for quantifying the emergence of preferred phases when two micromasers are coupled together. Using p…


[Phys. Rev. A 94, 063819] Published Wed Dec 07, 2016

Categories: Journals, Physics

Loops and Strings in a Superconducting Lattice Gauge Simulator

Author(s): G. K. Brennen, G. Pupillo, E. Rico, T. M. Stace, and D. Vodola

We propose an architecture for an analog quantum simulator of electromagnetism in 2+1 dimensions, based on an array of superconducting fluxonium devices. The encoding is in the integer (spin-1) representation of the quantum link model formulation of compact U(1) lattice gauge theory. We show how to …


[Phys. Rev. Lett. 117, 240504] Published Wed Dec 07, 2016

Categories: Journals, Physics

Gaussian Intrinsic Entanglement

Author(s): Ladislav Mišta, Jr. and Richard Tatham

We introduce a cryptographically motivated quantifier of entanglement in bipartite Gaussian systems called Gaussian intrinsic entanglement (GIE). The GIE is defined as the optimized mutual information of a Gaussian distribution of outcomes of measurements on parts of a system, conditioned on the out…


[Phys. Rev. Lett. 117, 240505] Published Wed Dec 07, 2016

Categories: Journals, Physics

Quasi-Many-Body Localization in Translation-Invariant Systems

Author(s): N. Y. Yao, C. R. Laumann, J. I. Cirac, M. D. Lukin, and J. E. Moore

In spin ladder systems, a single characteristic length scale controls the behavior of the spin polarization.


[Phys. Rev. Lett. 117, 240601] Published Wed Dec 07, 2016

Categories: Journals, Physics

Viewpoint: Superfluids Hit the Street

APS Physics - Wed, 2016-12-07 17:00

Author(s): Nick G. Parker

A flow pattern dubbed the von Kármán vortex street, which is renowned for its aesthetic beauty and extreme power, has been created in a superfluid.


[Physics 9, 143] Published Wed Dec 07, 2016

Categories: Physics

Synopsis: Wetting Matters When Emptying a Tank

APS Physics - Wed, 2016-12-07 17:00

The speed at which water drains out of a tank depends on the affinity of water with the outside surface of the orifice through which it drains.  


[Physics] Published Wed Dec 07, 2016

Categories: Physics

Synopsis: Starting Fluid for Laser Fusion

APS Physics - Wed, 2016-12-07 17:00

A laser-based fusion experiment demonstrates that liquid fuel capsules could rectify problems encountered with ice-based fuel capsules.


[Physics] Published Wed Dec 07, 2016

Categories: Physics

Entanglement detection on an NMR quantum-information processor using random local measurements

PRA: Quantum information - Wed, 2016-12-07 17:00

Author(s): Amandeep Singh, Arvind, and Kavita Dorai

Random local measurements have recently been proposed to construct entanglement witnesses and thereby detect the presence of bipartite entanglement. We experimentally demonstrate the efficacy of one such scheme on a two-qubit NMR quantum-information processor. We show that a set of three random loca…


[Phys. Rev. A 94, 062309] Published Wed Dec 07, 2016

Categories: Journals, Physics
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