The solid-state quantum repeater

C.Y. Hu, JG Rarity

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

Over the last decade, the record distance for quantum communications remains in the range of 100 km due to losses and decoherence in the quantum channel. To achieve long distance, H.J. Briegel et al proposed a quantum repeater protocol, which combine quantum memory, entanglement purification and entanglement swapping [1]. Due to the lack of perfect quantum memory, the quantum repeater has not yet been implemented experimentally though much efforts have been made over many years. Here we present a solid-state repeater scheme using a quantum-dot spin in an optical microcavity [2,3]. This repeater has several advantages: (1) deterministic (if optimized); (2) complete and loss-resistant Bell-state analyzer with a built-in spin memory; (3) the storage time for spin memory could be significantly prolonged using proposed spin-echo techniques; (4) compatible with standard semiconductor processing techniques. [1] H. -J. Briegel et al, Phys. Rev. Lett. 81, 5932 (1998). [2] C.Y. Hu et al, Phys. Rev. B, 78, 085307 (2008); 78, 125316 (2008); 80, 205326 (2009). [3] C.Y. Hu and J.G. Rarity, ArXiv: quant-ph 1005.5545 (2010). [4] S. Reitzenstein et al, Appl. Phys. Lett. 90, 251109 (2007).
Translated title of the contributionThe solid-state quantum repeater
Original languageEnglish
Title of host publicationQuantum Dot Day 2011, January 10 , Bristol
Publication statusPublished - 2011

Bibliographical note

Conference Organiser: University of Bristol

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