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1.
Oneatom maser: Nonseparable atom pairs
Open Access
Title:
Oneatom maser: Nonseparable atom pairs
Author:
Bertholdgeorg Englert
;
Pavel Lougovski
;
Enrique Solano
;
Herbert Walther
Bertholdgeorg Englert
;
Pavel Lougovski
;
Enrique Solano
;
Herbert Walther
Minimize authors
Description:
When a oneatom maser is operated in the standard way — excited, resonant twolevel atoms traverse the resonator at random times — the emerging atoms are entangled with the cavity field. As a consequence, the results of measurements on different atoms tend to be correlated. We show that truly nonclassical correlations can be found between two s...
When a oneatom maser is operated in the standard way — excited, resonant twolevel atoms traverse the resonator at random times — the emerging atoms are entangled with the cavity field. As a consequence, the results of measurements on different atoms tend to be correlated. We show that truly nonclassical correlations can be found between two successive atoms by studying the properties of the reduced state of such an atom pair. In particular, we calculate its degree of separability and find parameter ranges in which it is markedly less than unity. When a twolevel atom and a photon mode undergo a Jaynes–Cummings interaction [1], they become entangled as a rule. Various aspects of atomfield entanglement of this kind have been studied in past years, whereby the emphasis is usually — but not always [2] — on the consequent atomatom entanglement
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Contributors:
The Pennsylvania State University CiteSeerX Archives
Year of Publication:
20121205
Source:
http://arxiv.org/pdf/quantph/0209128v1.pdf
http://arxiv.org/pdf/quantph/0209128v1.pdf
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Document Type:
text
Language:
en
Rights:
Metadata may be used without restrictions as long as the oai identifier remains attached to it.
Metadata may be used without restrictions as long as the oai identifier remains attached to it.
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URL:
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.252.9084
http://arxiv.org/pdf/quantph/0209128v1.pdf
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.252.9084
http://arxiv.org/pdf/quantph/0209128v1.pdf
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2.
Quantum Computing, Metrology, and Imaging
Open Access
Title:
Quantum Computing, Metrology, and Imaging
Author:
Hwang Lee
;
Pavel Lougovski
;
Jonathan P. Dowling
Hwang Lee
;
Pavel Lougovski
;
Jonathan P. Dowling
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Description:
Information science is entering into a new era in which certain subtleties of quantum mechanics enables large enhancements in computational efficiency and communication security. Naturally, precise control of quantum systems required for the implementation of quantum information processing protocols implies potential breakthoughs in other scienc...
Information science is entering into a new era in which certain subtleties of quantum mechanics enables large enhancements in computational efficiency and communication security. Naturally, precise control of quantum systems required for the implementation of quantum information processing protocols implies potential breakthoughs in other sciences and technologies. We discuss recent developments in quantum control in optical systems and their applications in metrology and imaging.
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Contributors:
The Pennsylvania State University CiteSeerX Archives
Year of Publication:
20121205
Source:
http://arxiv.org/pdf/quantph/0506150v1.pdf
http://arxiv.org/pdf/quantph/0506150v1.pdf
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Document Type:
text
Language:
en
Subjects:
Quantum computing ; quantum entanglement ; optical interferometers ; High NOON states ; Heisenberg
Quantum computing ; quantum entanglement ; optical interferometers ; High NOON states ; Heisenberg
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Rights:
Metadata may be used without restrictions as long as the oai identifier remains attached to it.
Metadata may be used without restrictions as long as the oai identifier remains attached to it.
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URL:
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.252.7885
http://arxiv.org/pdf/quantph/0506150v1.pdf
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.252.7885
http://arxiv.org/pdf/quantph/0506150v1.pdf
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3.
Quantum state engineering and reconstruction in cavity QED: An analytical approach
Title:
Quantum state engineering and reconstruction in cavity QED: An analytical approach
Author:
Lougovski, Pavel
Lougovski, Pavel
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Description:
The models of a stronglydriven micromaser and a oneatom laser are developed. Their analytical solutions are obtained by means of phase space techniques. It is shown how to exploit the model of a oneatom laser for simultaneous generation and monitoring of the decoherence of the atomfield "Schrödinger cat" states. The similar machinery applied...
The models of a stronglydriven micromaser and a oneatom laser are developed. Their analytical solutions are obtained by means of phase space techniques. It is shown how to exploit the model of a oneatom laser for simultaneous generation and monitoring of the decoherence of the atomfield "Schrödinger cat" states. The similar machinery applied to the problem of the generation of the maximallyentangled states of two atoms placed inside an optical cavity permits its analytical solution. The steadystate solution of the problem exhibits a structure in which the twoatom maximallyentangled state correlates with the vacuum state of the cavity. As a consequence, it is demonstrated that the atomic maximallyentangled state, depending on a coupling regime, can be produced via a single or a sequence of nophoton measurements. The question of the implementation of a quantum memory device using a dispersive interaction between the collective internal ground state of an atomic ensemble and two orthogonal modes of a cavity is addressed. The problem of quantum state reconstruction in the context of cavity quantum electrodynamics is considered. The optimal operational definition of the Wigner function of a cavity field is worked out. It is based on the Fresnel transform of the atomic invertion of a probe atom. The general integral transformation for the Wigner function reconstruction of a particle in an arbitrary symmetric potential is derived.
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Publisher:
LudwigMaximiliansUniversität München
Year of Publication:
20040923
Document Type:
Dissertation ; NonPeerReviewed
Subjects:
Fakultät für Physik
Fakultät für Physik
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DDC:
535 Light & infrared & ultraviolet phenomena
(computed)
Relations:
http://edoc.ub.unimuenchen.de/2638/
URL:
http://edoc.ub.unimuenchen.de/2638/1/lougovski_pavel.pdf
http://nbnresolving.de/urn:nbn:de:bvb:1926381
http://edoc.ub.unimuenchen.de/2638/1/lougovski_pavel.pdf
http://nbnresolving.de/urn:nbn:de:bvb:1926381
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University of Munich: Digital theses
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4.
Quantum description and properties of electrons emitted from pulsed nanotip electron sources
Open Access
Title:
Quantum description and properties of electrons emitted from pulsed nanotip electron sources
Author:
Lougovski, Pavel
;
Batelaan, Herman
Lougovski, Pavel
;
Batelaan, Herman
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Description:
We present a quantum calculation of the electron degeneracy for electron sources. We explore quantum interference of electrons in the temporal and spatial domain and demonstrate how it can be utilized to characterize a pulsed electron source. We estimate effects of Coulomb repulsion on twoelectron interference and show that currently available ...
We present a quantum calculation of the electron degeneracy for electron sources. We explore quantum interference of electrons in the temporal and spatial domain and demonstrate how it can be utilized to characterize a pulsed electron source. We estimate effects of Coulomb repulsion on twoelectron interference and show that currently available nano tip pulsed electron sources operate in the regime where the quantum nature of electrons can be made dominant.
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Year of Publication:
20110331
Document Type:
text
Subjects:
Quantum Physics
Quantum Physics
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URL:
http://arxiv.org/abs/1103.6195
http://arxiv.org/abs/1103.6195
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Content Provider:
ArXiv.org (Cornell University Library)
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5.
An ObservedDataConsistent Approach to the Assignment of Bit Values in a Quantum Random Number Generator
Open Access
Title:
An ObservedDataConsistent Approach to the Assignment of Bit Values in a Quantum Random Number Generator
Author:
Lougovski, Pavel
;
Pooser, Raphael
Lougovski, Pavel
;
Pooser, Raphael
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Description:
The majority of Quantum Random Number Generators (QRNG) are designed as converters of a continuous quantum random variable into a discrete classical random bit value. For the resulting random bit sequence to be minimally biased, the conversion process demands an experimenter to fully characterize the underlying quantum system and implement param...
The majority of Quantum Random Number Generators (QRNG) are designed as converters of a continuous quantum random variable into a discrete classical random bit value. For the resulting random bit sequence to be minimally biased, the conversion process demands an experimenter to fully characterize the underlying quantum system and implement parameter estimation routines. Here we show that conventional approaches to parameter estimation (such as e.g. {\it Maximum Likelihood Estimation}) used on a finite QRNG data sample without caution may introduce binning bias and lead to overestimation of the randomness of the QRNG output. To bypass these complications, we develop an alternative conversion approach based on the Bayesian statistical inference method. We illustrate our approach using experimental data from a timeofarrival QRNG and numerically simulated data from a vacuum homodyning QRNG. Sidebyside comparison with the conventional conversion technique shows that our method provides an automatic online bias control and naturally bounds the best achievable QRNG bit rate for a given measurement record. ; Comment: submitted for publication
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Year of Publication:
20140423
Document Type:
text
Subjects:
Quantum Physics
Quantum Physics
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DDC:
310 Collections of general statistics
(computed)
URL:
http://arxiv.org/abs/1404.5977
http://arxiv.org/abs/1404.5977
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ArXiv.org (Cornell University Library)
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6.
Emergent Quantum Jumps in a NanoElectroMechanical System
Open Access
Title:
Emergent Quantum Jumps in a NanoElectroMechanical System
Author:
Jacobs, Kurt
;
Lougovski, Pavel
Jacobs, Kurt
;
Lougovski, Pavel
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Description:
We describe a nanoelectromechnical system that exhibits the "retroactive" quantum jumps discovered by Mabuchi and Wiseman [Phys. Rev. Lett. 81, 4620 (1998)]. This system consists of a Cooperpair box coupled to a nanomechanical resonator, in which the latter is continuously monitored by a singleelectron transistor or quantum pointcontact. Fu...
We describe a nanoelectromechnical system that exhibits the "retroactive" quantum jumps discovered by Mabuchi and Wiseman [Phys. Rev. Lett. 81, 4620 (1998)]. This system consists of a Cooperpair box coupled to a nanomechanical resonator, in which the latter is continuously monitored by a singleelectron transistor or quantum pointcontact. Further, we show that these kinds of jumps, and the jumps that emerge in a continuous quantum nondemolition measurement are one and the same phenomena. We also consider manipulating the jumps by applying feedback control to the Cooperpair box. ; Comment: 7 pages, revtex4, 1 eps figure. v2 and v3: presentation altered, references added
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Year of Publication:
20060607
Document Type:
text
Subjects:
Quantum Physics ; Condensed Matter  Mesoscale and Nanoscale Physics
Quantum Physics ; Condensed Matter  Mesoscale and Nanoscale Physics
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URL:
http://arxiv.org/abs/quantph/0606060
http://arxiv.org/abs/quantph/0606060
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Content Provider:
ArXiv.org (Cornell University Library)
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7.
Quantum Description and Properties of Electrons Emitted from Pulsed Nanotip Electron Sources
Title:
Quantum Description and Properties of Electrons Emitted from Pulsed Nanotip Electron Sources
Author:
Lougovski, Pavel
;
Batelaan, Herman
Lougovski, Pavel
;
Batelaan, Herman
Minimize authors
Description:
We present a quantum calculation of the electron degeneracy for electron sources. We explore quantum interference of electrons in the temporal and spatial domain and demonstrate how it can be utilized to characterize a pulsed electron source. We estimate effects of Coulomb repulsion on twoelectron interference and show that currently available ...
We present a quantum calculation of the electron degeneracy for electron sources. We explore quantum interference of electrons in the temporal and spatial domain and demonstrate how it can be utilized to characterize a pulsed electron source. We estimate effects of Coulomb repulsion on twoelectron interference and show that currently available nano tip pulsed electron sources operate in the regime where the quantum nature of electrons can be made dominant.
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Publisher:
DigitalCommons@University of Nebraska  Lincoln
Year of Publication:
20110101
Source:
Faculty Publications, Department of Physics and Astronomy
Faculty Publications, Department of Physics and Astronomy
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Document Type:
text
Subjects:
Physics
Physics
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URL:
http://digitalcommons.unl.edu/physicsfacpub/111
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1116&context=physicsfacpub
http://digitalcommons.unl.edu/physicsfacpub/111
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1116&context=physicsfacpub
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Content Provider:
University of NebraskaLincoln: DigitalCommons@UNL
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8.
Continous Measurement of the Energy Eigenstates of a Nanomechanical Resonator without a NonDemolition Probe
Open Access
Title:
Continous Measurement of the Energy Eigenstates of a Nanomechanical Resonator without a NonDemolition Probe
Author:
Jacobs, Kurt
;
Lougovski, Pavel
;
Blencowe, Miles
Jacobs, Kurt
;
Lougovski, Pavel
;
Blencowe, Miles
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Description:
We show that it is possible to perform a continuous measurement that continually projects a nanoresonator into its energy eigenstates by employing a linear coupling with a twostate system. This technique makes it possible to perform a measurement that exposes the quantum nature of the resonator by coupling it to a Cooperpair Box and a superco...
We show that it is possible to perform a continuous measurement that continually projects a nanoresonator into its energy eigenstates by employing a linear coupling with a twostate system. This technique makes it possible to perform a measurement that exposes the quantum nature of the resonator by coupling it to a Cooperpair Box and a superconducting transmissionline resonator. ; Comment: 4 pages, revtex4, two eps figures. v2: new results, much improved implementation; v4: published version, some terminology changed
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Year of Publication:
20060714
Document Type:
text
Subjects:
Quantum Physics ; Condensed Matter  Mesoscale and Nanoscale Physics
Quantum Physics ; Condensed Matter  Mesoscale and Nanoscale Physics
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URL:
http://arxiv.org/abs/quantph/0607102
http://arxiv.org/abs/quantph/0607102
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Content Provider:
ArXiv.org (Cornell University Library)
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9.
Quantum Computing, Metrology, and Imaging
Open Access
Title:
Quantum Computing, Metrology, and Imaging
Author:
Lee, Hwang
;
Lougovski, Pavel
;
Dowling, Jonathan P.
Lee, Hwang
;
Lougovski, Pavel
;
Dowling, Jonathan P.
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Description:
Information science is entering into a new era in which certain subtleties of quantum mechanics enables large enhancements in computational efficiency and communication security. Naturally, precise control of quantum systems required for the implementation of quantum information processing protocols implies potential breakthoughs in other scienc...
Information science is entering into a new era in which certain subtleties of quantum mechanics enables large enhancements in computational efficiency and communication security. Naturally, precise control of quantum systems required for the implementation of quantum information processing protocols implies potential breakthoughs in other sciences and technologies. We discuss recent developments in quantum control in optical systems and their applications in metrology and imaging. ; Comment: 11 pages, 6 figures; Proceedings of SPIE: Fluctuations and Noise in Photonics and Quantum Optics III (2005)
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Year of Publication:
20050617
Document Type:
text
Subjects:
Quantum Physics
Quantum Physics
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URL:
http://arxiv.org/abs/quantph/0506150
http://arxiv.org/abs/quantph/0506150
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ArXiv.org (Cornell University Library)
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10.
Characterizing Entanglement Sources
Open Access
Title:
Characterizing Entanglement Sources
Author:
Lougovski, Pavel
;
van Enk, S. J.
Lougovski, Pavel
;
van Enk, S. J.
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Description:
We discuss how to characterize entanglement sources with finite sets of measurements. The measurements do not have to be tomographically complete, and may consist of POVMs rather than von Neumann measurements. Our method yields a probability that the source generates an entangled state as well as estimates of any desired calculable entanglement ...
We discuss how to characterize entanglement sources with finite sets of measurements. The measurements do not have to be tomographically complete, and may consist of POVMs rather than von Neumann measurements. Our method yields a probability that the source generates an entangled state as well as estimates of any desired calculable entanglement measures, including their error bars. We apply two criteria, namely Akaike's information criterion and the Bayesian information criterion, to compare and assess different models (with different numbers of parameters) describing entanglementgenerating devices. We discuss differences between standard entanglementverificaton methods and our present method of characterizing an entanglement source. ; Comment: This submission, together with the next one, supersedes arXiv:0806.4165
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Year of Publication:
20090803
Document Type:
text
Subjects:
Quantum Physics
Quantum Physics
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URL:
http://arxiv.org/abs/0908.0265
http://arxiv.org/abs/0908.0265
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Author
(18) Lougovski, Pavel
(8) van Enk, S. J.
(3) Choi, Kyung Soo
(3) Deng, Hui
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(3) Papp, Scott B.
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