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Enhanced Quantum State Detection Efficiency Through Quantum Information Processing

Published

Author(s)

T Schaetz, Murray D. Barrett, Dietrich G. Leibfried, Joseph W. Britton, J Chiaverini, Wayne M. Itano, John D. Jost, E Knill, Christopher Langer, David J. Wineland

Abstract

We investigate theoretically and experimentally how quantum state-detection efficiency is improved by the use of quantum information processing (QIP). Experimentally, we encode the state of one 9Be ion qubit with one additional ancilla qubit. By measuring both qubits, we reduce the state-detection error in the presence of noise. The deviation from the theoretically allowed reduction is due to infidelities of the QIP operations. Applying this general scheme to more ancilla qubits suggests that error in the individual qubit measurements need not be a limit to scalable quantum computation.
Citation
Physical Review Letters
Volume
94

Citation

Schaetz, T. , Barrett, M. , Leibfried, D. , Britton, J. , Chiaverini, J. , Itano, W. , Jost, J. , Knill, E. , Langer, C. and Wineland, D. (2005), Enhanced Quantum State Detection Efficiency Through Quantum Information Processing, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105071 (Accessed October 28, 2021)
Created January 1, 2005, Updated February 17, 2017