Quantum entanglement and teleportation of electrons in 1D channels


Andrea Bertoni




Wednesday, 11 January 2012, 11:30
Matfys library

Abstract:
Quantum teleportation is one of the most remarkable results of quantum information processing. It consists in the faithful transfer of an arbitrary quantum state from one location to another one without prior knowledge of the state itself by exploiting the power of quantum entanglement. In the last decade, the great efforts to realize teleportation devices have lead to successful results in NMR, atomic and optical systems. However, none of these experimental setups seems to have the scalability of a semiconductor device. A proposal for the non-deterministic quantum teleportation of electrons in an edge channel setup operating in the integer quantum Hall regime will be presented. The proposed scheme consists of two concatenated two-particle Hanbury Brown-Twiss (HBT) interferometers [Samuelsson et al., PRL 92, 026805 (2004); Neder et al., Nature, 448, 333 (2007)] and, in analogy with quantum optics implementations, can be realized by means of linear quantum gates only. We will describe the teleportation protocol based on non-interacting edge channels [Buscemi et al., arXiv:1109.6551v1] and its theoretical fidelity. Furthermore we will illustrate numerical simulation of electron dynamics in coupled 1D channels, where maximally-entangled Bell states can be obtained.