Quantum-dot single-photon sources: Prospects for applications in linear optics quantum-information processing

A. Kiraz, M. Atatüre, and A. Imamoğlu
Phys. Rev. A 69, 032305 – Published 10 March 2004; Erratum Phys. Rev. A 70, 059904 (2004)

Abstract

An optical source that produces single-photon pulses on demand has potential applications in linear optics quantum computation, provided that stringent requirements on indistinguishability and collection efficiency of the generated photons are met. We show that these are conflicting requirements for anharmonic emitters that are incoherently pumped via reservoirs. As a model for a coherently pumped single photon source, we propose cavity-assisted spin-flip Raman transitions in a single electron charged quantum dot embedded in a microcavity. We demonstrate that using such a source, arbitrarily high collection efficiency and indistinguishability of the generated photons can be obtained simultaneously with increased cavity coupling. We analyze the role of errors that arise from distinguishability of the single-photon pulses in linear optics quantum gates by relating the gate fidelity to the strength of the two-photon interference dip in photon cross-correlation measurements. We find that performing controlled phase operations with error <1% requires nanocavities with Purcell factors FP40 in the absence of dephasing, without necessitating the strong coupling limit.

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  • Received 21 August 2003

DOI:https://doi.org/10.1103/PhysRevA.69.032305

©2004 American Physical Society

Erratum

Authors & Affiliations

A. Kiraz1, M. Atatüre2,3, and A. Imamoğlu2,3,4

  • 1Department Chemie, Ludwig-Maximilians Universität München, Butenandtstr. 11, D-81377 Munich, Germany
  • 2Quantenelektronik, ETH-Hönggerberg, HPT G12, CH-8093 Zurich, Switzerland
  • 3IV. Physikalisches Institut, Universitat Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
  • 4Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey

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Issue

Vol. 69, Iss. 3 — March 2004

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