Journal article
Entanglement fidelity of quantum memories
- Abstract:
- We introduce a figure of merit for a quantum memory which measures the preservation of entanglement between a qubit stored in and retrieved from the memory and an auxiliary qubit. We consider a general quantum memory system consisting of a medium of two level absorbers, with the qubit to be stored encoded in a single photon. We derive an analytic expression for our figure of merit taking into account Gaussian fluctuations in the Hamiltonian parameters, which, for example, model inhomogeneous broadening and storage time dephasing. Finally we specialize to the case of an atomic quantum memory where fluctuations arise predominantly from Doppler broadening and motional dephasing.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 162.8KB, Terms of use)
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- Publisher copy:
- 10.1103/PhysRevA.74.050302
Authors
+ IST directorate (Integrated Project Qubit Applications)
More from this funder
- Funding agency for:
- Walmsley, I
- Grant:
- 015848
- Publisher:
- American Physical Society
- Journal:
- Physical Review A More from this journal
- Volume:
- 74
- Issue:
- 5
- Article number:
- 050302
- Publication date:
- 2006-11-01
- Edition:
- Publisher's version
- DOI:
- EISSN:
-
1094-1622
- ISSN:
-
1050-2947
- Language:
-
English
- Keywords:
- Subjects:
- UUID:
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uuid:dc7799c6-e8e0-4672-b222-cbab74a252cf
- Local pid:
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ora:1777
- Deposit date:
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2008-03-14
Terms of use
- Copyright holder:
- American Physical Society
- Copyright date:
- 2006
- Notes:
- Copyright 2006 The American Physical Society. Citation: Surmacz, K. et al. (2006). 'Entanglement fidelity of quantum memories', Physical Review A 72, 050302(R). [Available at http://link.aps.org/abstract/PRA/v74/e050302].
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