Document Detail

Quantum-dot spin-photon entanglement via frequency downconversion to telecom wavelength.
MedLine Citation:
PMID:  23151585     Owner:  NLM     Status:  In-Process    
Long-distance quantum teleportation and quantum repeater technologies require entanglement between a single matter quantum bit (qubit) and a telecommunications (telecom)-wavelength photonic qubit. Electron spins in III-V semiconductor quantum dots are among the matter qubits that allow for the fastest spin manipulation and photon emission, but entanglement between a single quantum-dot spin qubit and a flying (propagating) photonic qubit has yet to be demonstrated. Moreover, many quantum dots emit single photons at visible to near-infrared wavelengths, where silica fibre losses are so high that long-distance quantum communication protocols become difficult to implement. Here we demonstrate entanglement between an InAs quantum-dot electron spin qubit and a photonic qubit, by frequency downconversion of a spontaneously emitted photon from a singly charged quantum dot to a wavelength of 1,560 nanometres. The use of sub-10-picosecond pulses at a wavelength of 2.2 micrometres in the frequency downconversion process provides the necessary quantum erasure to eliminate which-path information in the photon energy. Together with previously demonstrated indistinguishable single-photon emission at high repetition rates, the present technique advances the III-V semiconductor quantum-dot spin system as a promising platform for long-distance quantum communication.
Kristiaan De Greve; Leo Yu; Peter L McMahon; Jason S Pelc; Chandra M Natarajan; Na Young Kim; Eisuke Abe; Sebastian Maier; Christian Schneider; Martin Kamp; Sven Höfling; Robert H Hadfield; Alfred Forchel; M M Fejer; Yoshihisa Yamamoto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Nature     Volume:  491     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  421-5     Citation Subset:  IM    
E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
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Comment In:
Nature. 2012 Nov 15;491(7424):343-4   [PMID:  23151575 ]

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