This is the program for the 2010 Joint Statistical Meetings in Vancouver, British Columbia.

Abstract Details

Activity Number: 522
Type: Contributed
Date/Time: Wednesday, August 4, 2010 : 10:30 AM to 12:20 PM
Sponsor: Section on Physical and Engineering Sciences
Abstract - #306562
Title: Robust Probe for the Quantum Pauli Channel
Author(s): Michael Frey*+ and Jeffrey Graham and Lucas Mentch and Amy Miller
Companies: Bucknell University and Susquehanna University and Bucknell University and Muskingum University
Address: Dept. of Mathematics, Lewisburg, PA, 17837,
Keywords: decoherence ; quantum metrology ; robust design ; quantum statistics ; Fisher information ; generalized variance
Abstract:

Qubits (quantum bits), the most elementary of quantum physical systems, are standard subjects of nano-scale experiments in quantum computing and related technologies. The three-parameter quantum Pauli channel comprehensively models the decoherence of a qubit, and experiments with qubits typically involve estimation of the channel's Pauli parameters as a preliminary step. A standard estimation design involves probing the Pauli channel with a sequence of prepared qubits. A quantum measurement is made on each channel output in sequence, and the results are assembled into an estimator of the channel parameters. The quantum Fisher information (QFI) is derived for this estimation design and, using the determinant of the QFI as a figure-of-merit, a "balanced" probe state is shown to be robust against both lack of knowledge of the channel parameters and error in probe state preparation.


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