Discrete tunable color entanglement

Ramelow, S., Ratschbacher, L., Fedrizzi, A., Langford, N. K. and Zeilinger, A. (2009) Discrete tunable color entanglement. Physical Review Letters, 103 25: 253601-1-253601-4. doi:10.1103/PhysRevLett.103.253601

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Author Ramelow, S.
Ratschbacher, L.
Fedrizzi, A.
Langford, N. K.
Zeilinger, A.
Title Discrete tunable color entanglement
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2009-12-18
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.103.253601
Open Access Status File (Publisher version)
Volume 103
Issue 25
Start page 253601-1
End page 253601-4
Total pages 4
Editor George Basbas
Jack Sandweiss
Reinhardt B. Schuhmann
Stanley G. Brown
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
020201 Atomic and Molecular Physics
Abstract Although frequency multiplexing of information has revolutionized the field of classical communications, the color degree of freedom (DOF) has been used relatively little for quantum applications. We experimentally demonstrate a new hybrid quantum gate that transfers polarization entanglement of nondegenerate photons onto the color DOF. We create, for the first time, high-quality, discretely color-entangled states (with energy band gap up to 8.4 THz) without any spectrally selective filtering, and unambiguously verify and quantify the amount of entanglement (tangle, 0.611±0.009) by reconstructing a restricted density matrix; we generate a range of maximally entangled states, including a set of mutually unbiased bases for an encoded qubit space. The technique can be generalized to transfer polarization entanglement onto other photonic DOFs, like orbital angular momentum.
Keyword Quantum communication
Photon Pairs
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
2010 Higher Education Research Data Collection
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Citation counts: TR Web of Science Citation Count  Cited 64 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 64 times in Scopus Article | Citations
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Created: Sun, 10 Jan 2010, 10:02:27 EST