Towards quantum communication with electron spins

We review our recent work towards quantum communication in a solid-state environment with qubits carried by electron spins. We propose three schemes to produce spin-entangled electrons, where the required separation of the partner electrons is achieved via Coulomb interaction. The non-product spinst...

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Bibliographic Details
Published in:Turkish journal of physics 2003, Vol.27 (5), p.427-441
Main Authors: SARAGA. D.S, LOSS, D, EGUES, J. C, RECHER, P, ENGEL, H. A, BURKARD, G
Format: Article
Language:English
Subjects:
communication
Coulomb etkileşimi
Coulomb interaction
Decoherence
electron spin
Elektron spini
Experimental Methods and Instrumentation for Particle and Nuclear Physics
Eşevresizlik
İletişim
Kuantum bilgisayar
Kuantum noktası
Kubit
Physics of Elementary Particles and Fields
Quantum computer
quantum dot
Qubit
Temel Parçacık ve Alan Fiziği
Temel Parçacık ve Nükleer Fizik Deney Yöntemleri ve Aletsel Uygulamaları
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Summary:We review our recent work towards quantum communication in a solid-state environment with qubits carried by electron spins. We propose three schemes to produce spin-entangled electrons, where the required separation of the partner electrons is achieved via Coulomb interaction. The non-product spinstates originate either from the Cooper pairs found in a superconductor, or in the ground state of a quantum dot with an even number of electrons. In a second stage, we show how spin-entanglement carried by a singlet can be detected in a beam-splitter geometry by an increased (bunching) or decreased (antibunching) noise signal. We also discuss how a local spin-orbit interaction can be used to provide a continuous modulation of the noise as a signature of entanglement. Finally, we review how one can use a quantum dot as a spin-filter, a spin-memory read-out, a probe for single-spin decoherence and, ultimately, a single-spin measurement apparatus.
ISSN:1300-0101