The production and detection of entangled and spatially separated electrons in small solid-state structures has recently attracted considerable theoretical interest and represents a major challenge for experiments. In this talk, we review various theoretical ideas for producing spin-entangled electrons in mesoscopic superconductor-normal junctions or coupled semiconductor quantum dots and discuss the problem of spatial separation. The possibility of detecting and quantifying electron spin entanglement without spin-sensitive probes using electronic beam splitters will be discussed. The situation for electrons is quite different from entangled photons, because in solids, entangled electrons are typically surrounded by many indistinguishable and interacting electrons. We discuss the complications arising from the presence of the other electrons (the Fermi liquid) and some implications of spin decoherence.
- http://journals.tubitak.gov.tr/physics/issues/fiz-03-27-5/fiz-27-5-10-0309-3.pdf - Review article: D. Saraga et al., "Towards Quantum Communication with Electron Spins"
- http://link.aps.org/abstract/PRB/v61/pR16303 - Article: "Noise of entangled electrons: Bunching and antibunching"
- http://link.aps.org/abstract/PRL/v91/e087903 - Article: "Lower Bound for Electron Spin Entanglement from Beam Splitter Current Correlations"
- http://link.aps.org/abstract/PRL/v89/e176401 - Article: "Rashba Spin-Orbit Interaction and Shot Noise for Spin-Polarized and Entangled Electrons"
- http://www.turpion.org/specials/pu/proceedings/2001/10/126.pdf - Review article: "Quantum Information Processing Using Electron Spins in Quantum Dots"