Minimal Entanglement Witness from Electrical Current Correlations

2017-11-09 13:15:00 2017-11-09 14:00:00 Europe/Helsinki Minimal Entanglement Witness from Electrical Current Correlations LTL Quantum Physics Seminar (Nanotalo). Speaker: Dr. Fredrik Brange (Lund University, Sweden). http://comp.aalto.fi/en/midcom-permalink-1e7a9a78f80754aa9a711e78bb34b94cb0cfa6dfa6d Puumiehenkuja 2, 02150, Espoo

LTL Quantum Physics Seminar (Nanotalo). Speaker: Dr. Fredrik Brange (Lund University, Sweden).

09.11.2017 / 13:15 - 14:00
Nanotalo, 161, Puumiehenkuja 2, 02150, Espoo, Otaniemi, FI

Despite great efforts, an unambiguous demonstration of entanglement of mobile electrons in solid state conductors is still lacking. Investigating theoretically a generic entangler-detector setup, we here show that a witness of entanglement between two flying electron qubits can be constructed from only two current cross correlation measurements, for any nonzero detector efficiencies and noncollinear polarization vectors. We find that all entangled pure states, but not all mixed ones, can be detected with only two measurements, except the maximally entangled states, which require three. Moreover, detector settings for optimal entanglement witnessing are presented.