AustralieFrV1, PascalFrancis, Curation, bibRecord, 002763

Generation of optical 'Schrödinger cats' from photon number states

Identifieur interne : 002763 ( PascalFrancis/Curation ); précédent : 002762; suivant : 002764

Generation of optical 'Schrödinger cats' from photon number states

Auteurs : Alexei Ourjoumtsev [France] ; Hyunseok Jeong [Australie] ; Rosa Tualle-Brouril [France] ; Philippe Grangier [France]

Source :

Nature : (London) [ 0028-0836 ] ; 2007.

RBID : Pascal:07-0495900

Descripteurs français

Pascal (Inist)
- Traitement information, Impulsion optique, Optique quantique, Information quantique, Fonction Wigner, Domaine temps fs, Etat nombre photon, 4250D, 0367, Etat chat Schrödinger.

English descriptors

KwdEn :
- Information processing, Optical pulse, Photon number state, Quantum information, Quantum optics, Schrödinger's cat state, Wigner function, fs range.

Abstract

Schrodinger's cat¹ is a Gedankenexperiment in quantum physics, in which an atomic decay triggers the death of the cat. Because quantum physics allow atoms to remain in superpositions of states, the classical cat would then be simultaneously dead and alive. By analogy, a 'cat' state of freely propagating light can be defined as a quantum superposition of well separated quasi-classical states^2,3-it is a classical light wave that simultaneously possesses two opposite phases. Such states play an important role in fundamental tests of quantum theory^4-7and in many quantum information processing tasks, including quantum computation⁸, quantum teleportation^9,10 and precision measurements". Recently, optical Schrödinger 'kittens' were prepared^12-14; however, they are too small for most of the aforementioned applications and increasing their size is experimentally challenging. Here we demonstrate, theoretically and experimentally, a protocol that allows the generation of arbitrarily large squeezed Schrödinger cat states, using homodyne detection and photon number states as resources. We implemented this protocol with light pulses containing two photons, producing a squeezed Schrödinger cat state with a negative Wigner function. This state clearly exhibits several quantum phase-space interference fringes between the 'dead' and 'alive' components, and is large enough to become useful for quantum information processing and experimental tests of quantum theory.

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A08	`01`	`1`	`ENG`	`@1 Generation of optical 'Schrödinger cats' from photon number states`
A11	`01`	`1`		`@1 OURJOUMTSEV (Alexei)`
A11	`02`	`1`		`@1 JEONG (Hyunseok)`
A11	`03`	`1`		`@1 TUALLE-BROURIL (Rosa)`
A11	`04`	`1`		`@1 GRANGIER (Philippe)`
A14	`01`			`@1 Laboratoire Charles Fabry de l'institut d'Optique, Université Paris-Sud, CNRS UMR 8501 @2 91127 Palaiseau @3 FRA @Z 1 aut. @Z 3 aut. @Z 4 aut.`
A14	`02`			`@1 Centre for Quantum Computer Technology, Department of Physics, University of Queensland @2 Brisbane, Queensland 4072 @3 AUS @Z 2 aut.`
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A21				`@1 2007`
A23	`01`			`@0 ENG`
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A44				`@0 0000 @1 © 2007 INIST-CNRS. All rights reserved.`
A45				`@0 27 ref.`
A47	`01`	`1`		`@0 07-0495900`
A60				`@1 P @3 CR`
A61				`@0 A`
A64	`01`	`1`		`@0 Nature : (London)`
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C01	`01`		`ENG`	@0 Schrodinger's cat¹ is a Gedankenexperiment in quantum physics, in which an atomic decay triggers the death of the cat. Because quantum physics allow atoms to remain in superpositions of states, the classical cat would then be simultaneously dead and alive. By analogy, a 'cat' state of freely propagating light can be defined as a quantum superposition of well separated quasi-classical states^2,3-it is a classical light wave that simultaneously possesses two opposite phases. Such states play an important role in fundamental tests of quantum theory^4-7and in many quantum information processing tasks, including quantum computation⁸, quantum teleportation^9,10 and precision measurements". Recently, optical Schrödinger 'kittens' were prepared^12-14; however, they are too small for most of the aforementioned applications and increasing their size is experimentally challenging. Here we demonstrate, theoretically and experimentally, a protocol that allows the generation of arbitrarily large squeezed Schrödinger cat states, using homodyne detection and photon number states as resources. We implemented this protocol with light pulses containing two photons, producing a squeezed Schrödinger cat state with a negative Wigner function. This state clearly exhibits several quantum phase-space interference fringes between the 'dead' and 'alive' components, and is large enough to become useful for quantum information processing and experimental tests of quantum theory.
C02	`01`	`3`		`@0 001B40B50D`
C03	`01`	`X`	`FRE`	`@0 Traitement information @5 03`
C03	`01`	`X`	`ENG`	`@0 Information processing @5 03`
C03	`01`	`X`	`SPA`	`@0 Procesamiento información @5 03`
C03	`02`	`X`	`FRE`	`@0 Impulsion optique @5 04`
C03	`02`	`X`	`ENG`	`@0 Optical pulse @5 04`
C03	`02`	`X`	`SPA`	`@0 Impulsión óptica @5 04`
C03	`03`	`3`	`FRE`	`@0 Optique quantique @5 19`
C03	`03`	`3`	`ENG`	`@0 Quantum optics @5 19`
C03	`04`	`3`	`FRE`	`@0 Information quantique @5 20`
C03	`04`	`3`	`ENG`	`@0 Quantum information @5 20`
C03	`05`	`X`	`FRE`	`@0 Fonction Wigner @5 23`
C03	`05`	`X`	`ENG`	`@0 Wigner function @5 23`
C03	`05`	`X`	`SPA`	`@0 Función Wigner @5 23`
C03	`06`	`3`	`FRE`	`@0 Domaine temps fs @5 41`
C03	`06`	`3`	`ENG`	`@0 fs range @5 41`
C03	`07`	`X`	`FRE`	`@0 Etat nombre photon @5 61`
C03	`07`	`X`	`ENG`	`@0 Photon number state @5 61`
C03	`07`	`X`	`SPA`	`@0 Estado número fotón @5 61`
C03	`08`	`3`	`FRE`	`@0 4250D @4 INC @5 83`
C03	`09`	`3`	`FRE`	`@0 0367 @4 INC @5 92`
C03	`10`	`3`	`FRE`	`@0 Etat chat Schrödinger @4 CD @5 96`
C03	`10`	`3`	`ENG`	`@0 Schrödinger's cat state @4 CD @5 96`
N21				`@1 323`

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Le document en format XML

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<author><name sortKey="Ourjoumtsev, Alexei" sort="Ourjoumtsev, Alexei" uniqKey="Ourjoumtsev A" first="Alexei" last="Ourjoumtsev">Alexei Ourjoumtsev</name>
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<front><div type="abstract" xml:lang="en">Schrodinger's cat<sup>1</sup>
 is a Gedankenexperiment in quantum physics, in which an atomic decay triggers the death of the cat. Because quantum physics allow atoms to remain in superpositions of states, the classical cat would then be simultaneously dead and alive. By analogy, a 'cat' state of freely propagating light can be defined as a quantum superposition of well separated quasi-classical states<sup>2,3</sup>
-it is a classical light wave that simultaneously possesses two opposite phases. Such states play an important role in fundamental tests of quantum theory<sup>4-7</sup>
and in many quantum information processing tasks, including quantum computation<sup>8</sup>
, quantum teleportation<sup>9,10</sup>
 and precision measurements". Recently, optical Schrödinger 'kittens' were prepared<sup>12-14</sup>
; however, they are too small for most of the aforementioned applications and increasing their size is experimentally challenging. Here we demonstrate, theoretically and experimentally, a protocol that allows the generation of arbitrarily large squeezed Schrödinger cat states, using homodyne detection and photon number states as resources. We implemented this protocol with light pulses containing two photons, producing a squeezed Schrödinger cat state with a negative Wigner function. This state clearly exhibits several quantum phase-space interference fringes between the 'dead' and 'alive' components, and is large enough to become useful for quantum information processing and experimental tests of quantum theory.</div>
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<fC01 i1="01" l="ENG"><s0>Schrodinger's cat<sup>1</sup>
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-it is a classical light wave that simultaneously possesses two opposite phases. Such states play an important role in fundamental tests of quantum theory<sup>4-7</sup>
and in many quantum information processing tasks, including quantum computation<sup>8</sup>
, quantum teleportation<sup>9,10</sup>
 and precision measurements". Recently, optical Schrödinger 'kittens' were prepared<sup>12-14</sup>
; however, they are too small for most of the aforementioned applications and increasing their size is experimentally challenging. Here we demonstrate, theoretically and experimentally, a protocol that allows the generation of arbitrarily large squeezed Schrödinger cat states, using homodyne detection and photon number states as resources. We implemented this protocol with light pulses containing two photons, producing a squeezed Schrödinger cat state with a negative Wigner function. This state clearly exhibits several quantum phase-space interference fringes between the 'dead' and 'alive' components, and is large enough to become useful for quantum information processing and experimental tests of quantum theory.</s0>
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<s5>20</s5>
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<s5>92</s5>
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<s4>CD</s4>
<s5>96</s5>
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Generation of optical 'Schrödinger cats' from photon number states

Generation of optical 'Schrödinger cats' from photon number states

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Abstract

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