1. Entanglement Detection with Non-Ideal Ferromagnetic Detectors
- Author
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P. Rożek, Christian Schönenberger, Waldemar Kłobus, J. Martinek, Andrzej Grudka, Damian Tomaszewski, Piotr Busz, and Andreas Baumgartner
- Subjects
Physics ,Quantum decoherence ,Quantum cryptography ,Spin polarization ,Quantum electrodynamics ,Quantum mechanics ,General Physics and Astronomy ,Quantum Physics ,Quantum entanglement ,Spin (physics) ,Squashed entanglement ,Quantum information science ,Entanglement witness - Abstract
Entangled states are essential in basics quantum communication protocols and quantum cryptography. Ferromagnetic contacts can work as a spin detector, giving possibility of converting information about electron spin to the electric charge, and therefore, detection of entangled states with the electric current measurements is possible. Method of confirming entanglement with non-ideal detectors is presented, the impact of decoherence and noise on states and quality of entanglement is discussed. Entanglement witness (EW) operator method is compared with the CHSH inequalities approach. Required spin polarization for the EW is lower than for the CHSH inequalities. System with asymmetric spin polarizations of detectors was analyzed, including the CHSH inequalities and the EW method.
- Published
- 2015
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