Ancilla-assisted quantum process tomography

Aletepeter, Joseph B., Branning, David, Jeffrey, Evan, Wei, T. C., Kwiat, Paul G., Thew, Robert T., O'Brien, Jeremy L., Nielsen, Michael A. and White, Andrew G. (2003) Ancilla-assisted quantum process tomography. Physical Review Letters, 90 19: 193601-1-193601-4. doi:10.1103/PhysRevLett.90.193601

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Author Aletepeter, Joseph B.
Branning, David
Jeffrey, Evan
Wei, T. C.
Kwiat, Paul G.
Thew, Robert T.
O'Brien, Jeremy L.
Nielsen, Michael A.
White, Andrew G.
Title Ancilla-assisted quantum process tomography
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2003-05-15
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.90.193601
Open Access Status File (Publisher version)
Volume 90
Issue 19
Start page 193601-1
End page 193601-4
Total pages 4
Editor Martin Blume
Place of publication College Pk
Publisher American Physical Society
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
240402 Quantum Optics and Lasers
Abstract Complete and precise characterization of a quantum dynamical process can be achieved via the method of quantum process tomography. Using a source of correlated photons, we have implemented several methods, each investigating a wide range of processes, e.g., unitary, decohering, and polarizing. One of these methods, ancilla-assisted process tomography (AAPT), makes use of an additional ancilla system, and we have theoretically determined the conditions when AAPT is possible. Surprisingly, entanglement is not required. We present data obtained using both separable and entangled input states. The use of entanglement yields superior results, however.
Keyword quantum optics
laser science
atom optics
quantum computation
quantum information
Q-Index Code C1
Additional Notes URL: This article is available as a preprint.

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Created: Wed, 15 Aug 2007, 12:04:16 EST