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Experimental estimation of one-parameter qubit gates in the presence of phase diffusion

Source: Phys. Rev. A 81, 012305 (2010); doi:10.1103/PhysRevA.81.012305

Published 7 January 2010

PACS
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 03.65.Wj
    State reconstruction, quantum tomography
  • 42.50.St
    Nonclassical interferometry, subwavelength lithography (quantum optics)
  • YEAR: 2010
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
Davide Brivio, Simone Cialdi, and Stefano Vezzoli
Dipartimento di Fisica dellUniversit degli Studi di Milano, I-20133 Milano, Italia and
INFN, Sezione di Milano, I-20133 Milano, Italia

Berihu Teklu Gebrehiwot, Marco G. Genoni, and Stefano Olivares
CNISM UdR Milano Universit, I-20133 Milano, Italia and
Dipartimento di Fisica dellUniversit degli Studi di Milano, I-20133 Milano, Italia

Matteo G. A. Paris
Dipartimento di Fisica dellUniversit degli Studi di Milano, I-20133 Milano, Italia,
CNISM UdR Milano Universit, I-20133 Milano, Italia, and
ISI Foundation, I-10133 Torino, Italia
We address estimation of one-parameter qubit gates in the presence of phase diffusion. We evaluate the ultimate quantum limits to precision, seek optimal probes and measurements, and demonstrate an optimal estimation scheme for polarization encoded optical qubits. An adaptive method to achieve optimal estimation in any working regime is also analyzed in detail and experimentally implemented. ©2010 The American Physical Society
History: Received 9 October 2009; published 7 January 2010
Permalink: http://link.aps.org/abstract/PRA/v81/e012305
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