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Controlled Phase Shifts with a Single Quantum Dot

Fushman, Ilya and Englund, Dirk and Faraon, Andrei and Stoltz, Nick and Petroff, Pierre and Vučković, Jelena (2008) Controlled Phase Shifts with a Single Quantum Dot. Science, 320 (5877). pp. 769-772. ISSN 0036-8075. doi:10.1126/science.1154643.

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Optical nonlinearities enable photon-photon interaction and lie at the heart of several proposals for quantum information processing, quantum nondemolition measurements of photons, and optical signal processing. To date, the largest nonlinearities have been realized with single atoms and atomic ensembles. We show that a single quantum dot coupled to a photonic crystal nanocavity can facilitate controlled phase and amplitude modulation between two modes of light at the single-photon level. At larger control powers, we observed phase shifts up to π/4 and amplitude modulation up to 50%. This was accomplished by varying the photon number in the control beam at a wavelength that was the same as that of the signal, or at a wavelength that was detuned by several quantum dot linewidths from the signal. Our results present a step toward quantum logic devices and quantum nondemolition measurements on a chip.

Item Type:Article
Related URLs:
URLURL TypeDescription 10.1126/science.1154643DOIArticle
Englund, Dirk0000-0002-1043-3489
Faraon, Andrei0000-0002-8141-391X
Additional Information:© 2008 American Association for the Advancement of Science. Received for publication 26 December 2007. Accepted for publication 1 April 2008. Financial support was provided by the Multidisciplinary University Research Incentive Center for photonic quantum information systems (Army Research Office/Intelligence Advanced Research Projects Agency Program DAAD19-03-1-0199), Office of Naval Research Young Investigator Award, and NSF grant CCF-0507295. D.E. and I.F. were also supported by a National Defense Science and Engineering Graduate fellowship. Part of the work was performed at the Stanford Nanofabrication Facility of the National Nanotechnology Infrastructure Network supported by the NSF under grant ECS-9731293.
Funding AgencyGrant Number
Army Research Office (ARO)DAAD19-03-1-0199
Office of Naval Research (ONR)UNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
Issue or Number:5877
Record Number:CaltechAUTHORS:20120918-073412633
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Official Citation:Controlled Phase Shifts with a Single Quantum Dot Ilya Fushman, Dirk Englund, Andrei Faraon, Nick Stoltz, Pierre Petroff, and Jelena Vučković Science 9 May 2008: 769-772.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34160
Deposited By: Ruth Sustaita
Deposited On:18 Sep 2012 15:01
Last Modified:09 Nov 2021 23:06

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