All-optical measurement-based quantum-information processing in quantum dots

Kolli, A, Lovett, BW, Benjamin, SC and Stace, TM (2006) All-optical measurement-based quantum-information processing in quantum dots. Physical Review Letters, 97 25: 250504-1-250504-4. doi:10.1103/PhysRevLett.97.250504

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Author Kolli, A
Lovett, BW
Benjamin, SC
Stace, TM
Title All-optical measurement-based quantum-information processing in quantum dots
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2006-12-22
Year available 2006
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.97.250504
Open Access Status File (Publisher version)
Volume 97
Issue 25
Start page 250504-1
End page 250504-4
Total pages 4
Place of publication College Pk
Publisher American Physical Soc
Language eng
Abstract Parity measurements on qubits can generate the entanglement resource necessary for scalable quantum computation. Here we describe a method for fast optical parity measurements on electron spin qubits within coupled quantum dots. The measurement scheme, which can be realized with existing technology, consists of the optical excitation of excitonic states followed by monitored relaxation. Conditional on the observation of a photon, the system is projected into the odd/even-parity subspaces. Our model incorporates all the primary sources of error, including detector inefficiency, effects of spatial separation and nonresonance of the dots, and also unwanted excitations. Through an analytical treatment we establish that the scheme is robust to such effects. Two applications are presented: a realization of a controlled-NOT gate, and a technique for growing large scale graph states.
Keyword Physics, Multidisciplinary
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 19 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 19 times in Scopus Article | Citations
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Created: Sat, 26 Jan 2008, 03:01:31 EST