Showing 2012 · quant-phShow all

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quant-ph2012★ 138 cited

Bulk Nuclear Polarization Enhanced at Room-Temperature by Optical Pumping

Ran Fischer, Christian O. Bretschneider, Paz London +3

Bulk 13C polarization can be strongly enhanced in diamond at room-temperature based on the optical pumping of nitrogen-vacancy color centers. This effect was confirmed by irradiati…

quant-ph2012★ 108 cited

Markovian Master Equation and Thermodynamics of Two-level System in Strong Laser Field

K. Szczygielski, D. Gelbwaser-Klimovsky, R. Alicki

The recently developed technique combining the weak coupling limit with the Floquet formalism is applied to a model of two-level atom driven by a strong laser field and weakly coup…

quant-ph2012★ 66 cited

Robustness of dynamical decoupling sequences

Mustafa Ahmed Ali Ahmed, Gonzalo A. Álvarez, Dieter Suter

Active protection of quantum states is an essential prerequisite for the implementation of quantum computing. Dynamical decoupling (DD) is a promising approach that applies sequenc…

quant-ph2012★ 15 cited

Engineering a thermal squeezed reservoir by system energy modulation

Ephraim Shahmoon, Gershon Kurizki

We show that a thermal reservoir can effectively act as a squeezed reservoir on atoms that are subject to energy-level modulation. For sufficiently fast and strong modulation, for…

quant-ph2012★ 40 cited

Work extraction via quantum nondemolition measurements of qubits in cavities: Non-Markovian effects

David Gelbwaser-Klimovsky, Noam Erez, Robert Alicki +1

We show that frequent nondemolition measurements of a quantum system immersed in a thermal bath allow the extraction of work in a closed cycle from the system-bath interaction (cor…

quant-ph2012★ 25 cited

Molecular spinning by a chiral train of short laser pulses

Johannes Floß, Ilya Sh. Averbukh

We provide a detailed theoretical analysis of molecular rotational excitation by a chiral pulse train -- a sequence of linearly polarised pulses with the polarisation direction rot…

quant-ph2012★ 12 cited

Factorization of numbers with Gauss sums: II. Suggestions for implementations with chirped laser pulses

W. Merkel, S. Wölk, W. P. Schleich +3

We propose three implementations of the Gauss sum factorization schemes discussed in part I of this series: (i) a two-photon transition in a multi-level ladder system induced by a…

quant-ph2012★ 23 cited

Factorization of numbers with Gauss sums: I. Mathematical background

S. Wölk, W. Merkel, W. P. Schleich +2

We use the periodicity properties of generalized Gauss sums to factor numbers. Moreover, we derive rules for finding the factors and illustrate this factorization scheme for variou…

quant-ph2012★ 67 cited

Engineering arbitrary pure and mixed quantum states

Alexander Pechen

This work addresses a fundamental problem of controllability of open quantum systems, meaning the ability to steer arbitrary initial system density matrix into any final density ma…

quant-ph2012★ 23 cited

Addressing Two-Level Systems Variably Coupled to an Oscillating Field

Nir Navon, Shlomi Kotler, Nitzan Akerman +3

We propose a simple method to spectrally resolve single-spins in a cold atomic system, thus realizing single-spin addressing. This scheme uses a dressing field with a spatially-dep…

quant-ph2012★ 163 cited

Minimal universal quantum heat machine

David Gelbwaser-Klimovsky, Robert Alicki, Gershon Kurizki

In traditional thermodynamics the Carnot cycle yields the ideal performance bound of heat engines and refrigerators. We propose and analyze a minimal model of a heat machine that c…

quant-ph2012★ 68 cited

Single-Spin Spectrum-Analyzer for a Strongly Coupled Environment

Shlomi Kotler, Nitzan Akerman, Yinnon Glickman +1

A qubit can be used as a sensitive spectrum analyzer of its environment. Here we show how the problem of spectral analysis of noise induced by a strongly coupled environment can be…

quant-ph2012★ 22 cited

Comments on "Cooling by Heating: Refrigerator Powered by Photons"

Amikam Levy, Robert Alicki, Ronnie Kosloff

We comment that the model proposed in Phys. Rev. Lett. 108, 120603 (2012) violates the dynamical version of the third law of thermodynamics. We discuses the different formulations…

quant-ph2012★ 93 cited

Quantum bath refrigeration towards absolute zero: unattainability principle challenged

Michal Kolář, David Gelbwaser-Klimovsky, Robert Alicki +1

A minimal model of a quantum refrigerator (QR), i.e. a periodically phase-flipped two-level system permanently coupled to a finite-capacity bath (cold bath) and an infinite heat du…

quant-ph2012★ 45 cited

Coherent Diffusion of Polaritons in Atomic Media

Ofer Firstenberg, Moshe Shuker, Amiram Ron +1

Coherent diffusion pertains to the motion of atomic dipoles experiencing frequent collisions in vapor while maintaining their coherence. Recent theoretical and experimental studies…

quant-ph2012★ 10 cited

Fourier processing of quantum light

Eilon Poem, Yehonatan Gilead, Yoav Lahini +1

It is shown that a classical optical Fourier processor can be used for the shaping of quantum correlations between two or more photons, and the class of Fourier masks applicable in…

quant-ph2012★ 9 cited

Emergence of a measurement basis in atom-photon scattering

Yinnon Glickman, Shlomi Kotler, Nitzan Akerman +1

The process of quantum measurement has been a long standing source of debate. A measurement is postulated to collapse a wavefunction onto one of the states of a predetermined set -…

quant-ph2012★ 194 cited

Quantum Refrigerator and the III-law of Thermodynamics

Amikam Levy, Robert Alicki, Ronnie Kosloff

The rate of temperature decrease of a cooled quantum bath is studied as its temperature is reduced to the absolute zero. The III-law of thermodynamics is then quantified dynamicall…

quant-ph2012★ 27 cited

Null Values and Quantum State Discrimination

Oded Zilberberg, Alessandro Romito, David J. Starling +4

We present a measurement protocol for discriminating between two different quantum states of a qubit with high fidelity. The protocol, called null value, is comprised of a projecti…

quant-ph2012★ 130 cited

Nonradiative interaction and entanglement between distant atoms

Ephraim Shahmoon, Gershon Kurizki

We show that nonradiative interactions between atomic dipoles placed in a waveguide can give rise to deterministic entanglement at ranges much larger than their resonant wavelength…

quant-ph2012★ 6 cited

Temperature crossover of decoherence rates in chaotic and regular bath dynamics

A. S. Sanz, Y. Elran, P. Brumer

The effect of chaotic bath dynamics on the decoherence of a quantum system is examined for the vibrational degrees of freedom of a diatomic molecule in a realistic, constant temper…

quant-ph2012★ 32 cited

Optimizing inhomogeneous spin ensembles for quantum memory

Guy Bensky, David Petrosyan, Johannes Majer +2

We propose a general method to maximize the fidelity of writing, storage and reading of quantum information (QI) in a spectrally inhomogeneous spin ensemble used as quantum memory.…

quant-ph2012★ 8 cited

Photon correlations in multi-mode waveguides

Eilon Poem, Yaron Silberberg

We consider the propagation of classical and non-classical light in multi-mode optical waveguides. We focus on the evolution of the few-photon correlation functions, which, much li…

quant-ph2012★ 53 cited

Phase Space Approach to Solving the Time-independent Schrödinger Equation

Asaf Shimshovitz, David J. Tannor

We propose a method for solving the time independent Schrödinger equation based on the von Neumann (vN) lattice of phase space Gaussians. By incorporating periodic boundary conditi…