Entanglement Detection with Non-Ideal Ferromagnetic Detectors

• Authors: P. Rożek , P. Busz , W. Kłobus , D. Tomaszewski , A. Grudka , A. Baumgartner , C. Schönenberger , J. Martinek
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

03.67.Mn; 03.67.Bg; 73.23.-b

Discipline

• 03.67.Bg: Entanglement production and manipulation(for entanglement in Bose-Einstein condensates, see 03.75.Gg)
• 03.67.Mn: Entanglement measures, witnesses, and other characterizations(see also 03.65.Ud Entanglement and quantum nonlocality; 42.50.Dv Quantum state engineering and measurements in quantum optics)
• 73.23.-b: Electronic transport in mesoscopic systems

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 493-495

Dates

published

2015-02

Contributors

author

P. Rożek

• Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznan, Poland

author

P. Busz

• Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznan, Poland

author

W. Kłobus

• Faculty of Physics, Adam Mickiewicz University, 61-614 Poznan, Poland

author

D. Tomaszewski

• Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznan, Poland

author

A. Grudka

• Faculty of Physics, Adam Mickiewicz University, 61-614 Poznan, Poland

author

A. Baumgartner

• Department of Physics, University of Basel, CH-4056 Basel, Switzerland

author

C. Schönenberger

• Department of Physics, University of Basel, CH-4056 Basel, Switzerland

author

J. Martinek

• Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznan, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.127.493