Towards Quantum Communication with Electron Spins

Authors : DS SARAGA, G BURKARD, J C EGUES, HA ENGEL

Pages : 427-442

View : 17 | Download : 9

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :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 spin-states 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 insert ignore into journalissuearticles values(bunching); or decreased insert ignore into journalissuearticles values(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.
Keywords : Turk J Phys, 27, 2003, 427 442 Turk J Phys, vol 27, iss 5