Ignorance is bliss: general and robust cancellation of decoherence via no-knowledge quantum feedback

Szigeti, Stuart S., Carvalho, Andre R. R., Morley, James G. and Hush, Michael R. (2014) Ignorance is bliss: general and robust cancellation of decoherence via no-knowledge quantum feedback. Physical Review Letters, 113 2: 020407-1-020407-6. doi:10.1103/PhysRevLett.113.020407

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Author Szigeti, Stuart S.
Carvalho, Andre R. R.
Morley, James G.
Hush, Michael R.
Title Ignorance is bliss: general and robust cancellation of decoherence via no-knowledge quantum feedback
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 1079-7114
0031-9007
Publication date 2014-07-10
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.113.020407
Open Access Status File (Publisher version)
Volume 113
Issue 2
Start page 020407-1
End page 020407-6
Total pages 6
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2015
Language eng
Abstract A "no-knowledge" measurement of an open quantum system yields no information about any system observable; it only returns noise input from the environment. Surprisingly, performing such a no-knowledge measurement can be advantageous. We prove that a system undergoing no-knowledge monitoring has reversible noise, which can be canceled by directly feeding back the measurement signal. We show how no-knowledge feedback control can be used to cancel decoherence in an arbitrary quantum system coupled to a Markovian reservoir that is being monitored. Since no-knowledge feedback does not depend on the system state or Hamiltonian, such decoherence cancellation is guaranteed to be general and robust, and can operate in conjunction with any other quantum control protocol. As an application, we show that no-knowledge feedback could be used to improve the performance of dissipative quantum computers subjected to local loss.
Keyword Quantum control
Open quantum systems
Quantum information
Dissipative quantum systems
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 2015 Collection
 
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Created: Sat, 02 Aug 2014, 11:31:18 EST by Stuart Szigeti on behalf of Engineered Quantum Systems