Quantum discrimination of Gaussian channels and technological applications

Seminar date and time: 
Friday, 5 March, 2010 - 15:00
Affiliation: 
MIT & University of York
Author: 
Stefano Pirandola
Location: 
Sala de Graus II (Campus UAB), first floor at tower C5, close to CREAF

The optimal discrimination of two Gaussian channels is a central problem in quantum information theory. In this talk we discuss how the use of quantum entanglement can reduce the error probability which affects this statistical problem, giving a dramatic advantage over the use of classical light in the regime of few photons.

This enhancement is exploited in two non-trivial tasks: the detection of low-reflectivity targets (quantum illumination [1,2]) and the readout of digital memories (quantum reading [3]).

[1] S.-H. Tan et al., Phys. Rev. Lett. 101, 253601 (2008)
[2] S. Pirandola, and S. Lloyd, Phys. Rev. A 78, 012331 (2008)
[3] S. Pirandola, arXiv:0907.3398

Campus d'excel·lència internacional U A B