Rapid readout of a register of qubits using open-loop quantum control

Combes, Joshua, Denney, Aaron and Wiseman, Howard M. (2015) Rapid readout of a register of qubits using open-loop quantum control. Physical Review A - Atomic, Molecular, and Optical Physics, 91 2: 022305.1-022305.8. doi:10.1103/PhysRevA.91.022305

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Author Combes, Joshua
Denney, Aaron
Wiseman, Howard M.
Title Rapid readout of a register of qubits using open-loop quantum control
Journal name Physical Review A - Atomic, Molecular, and Optical Physics   Check publisher's open access policy
ISSN 1094-1622
1050-2947
1538-4446
Publication date 2015-02-09
Sub-type Article (original research)
DOI 10.1103/PhysRevA.91.022305
Open Access Status File (Publisher version)
Volume 91
Issue 2
Start page 022305.1
End page 022305.8
Total pages 8
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2016
Language eng
Formatted abstract
Measurements are a primitive for characterizing quantum systems. Reducing the time taken to perform a measurement may be beneficial in many areas of quantum information processing. We show that permuting the eigenvalues of the state matrix in the logical basis, using open-loop control, provides an O(n) reduction in the measurement time, where n is the number of qubits in the register. This reduction is of the same order as the (previously introduced) locally optimal feedback protocol. The advantage of the open-loop protocol is that it is far less difficult experimentally. Because the control commutes with the measured observable at all times, our rapid measurement protocol could be used for characterizing a quantum system, by state or process tomography, or to implement measurement-based quantum error correction.
Keyword Quantum systems
Open-loop
Rapid measurement protocol
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
Official 2016 Collection
 
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