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Efficient tomography of quantum-optical Gaussian processes probed with a few coherent states.
- Source :
-
Physical Review A: Atomic, Molecular & Optical Physics . Aug2013, Vol. 88 Issue 2-A, p1-6. 6p. - Publication Year :
- 2013
-
Abstract
- An arbitrary quantum-optical process (channel) can be completely characterized by probing it with coherent states using the recently developed coherent-state quantum process tomography (QPT) [Lobino et al., Science 322, 563 (2008)]. In general, precise QPT is possible if an infinite set of probes is available. Thus, realistic QPT of infinite-dimensional systems is approximate due to a finite experimentally feasible set of coherent states and its related energy-cutoff approximation. We show with explicit formulas that one can completely identify a quantum-optical Gaussian process just with a few different coherent states without approximations like the energy cutoff. For tomography of multimode processes, our method exponentially reduces the number of different test states, compared with existing methods. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10502947
- Volume :
- 88
- Issue :
- 2-A
- Database :
- Academic Search Index
- Journal :
- Physical Review A: Atomic, Molecular & Optical Physics
- Publication Type :
- Periodical
- Accession number :
- 90463746
- Full Text :
- https://doi.org/10.1103/PhysRevA.88.022101