Abstract
| Language | English |
|---|---|
| Article number | 220404 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 97 |
| DOIs | |
| Publication status | Published - 2006 |
Fingerprint
Keywords
- interferometry
- fidelity
- interference
- coherence measures
Cite this
}
Fidelity and coherence measures from interference. / Oi, D.K.L.; Aberg, J.
In: Physical Review Letters, Vol. 97, 220404, 2006.Research output: Contribution to journal › Article
TY - JOUR
T1 - Fidelity and coherence measures from interference
AU - Oi, D.K.L.
AU - Aberg, J.
PY - 2006
Y1 - 2006
N2 - By utilizing single particle interferometry, the fidelity or coherence of a pair of quantum states is identified with their capacity for interference. We consider processes acting on the internal degree of freedom (e.g., spin or polarization) of the interfering particle, preparing it in states ρA or ρB in the respective path of the interferometer. The maximal visibility depends on the choice of interferometer, as well as the locality or nonlocality of the preparations, but otherwise depends only on the states ρA and ρB and not the individual preparation processes themselves. This allows us to define interferometric measures which probe locality and correlation properties of spatially or temporally separated processes, and can be used to differentiate between processes that cannot be distinguished by direct process tomography using only the internal state of the particle.
AB - By utilizing single particle interferometry, the fidelity or coherence of a pair of quantum states is identified with their capacity for interference. We consider processes acting on the internal degree of freedom (e.g., spin or polarization) of the interfering particle, preparing it in states ρA or ρB in the respective path of the interferometer. The maximal visibility depends on the choice of interferometer, as well as the locality or nonlocality of the preparations, but otherwise depends only on the states ρA and ρB and not the individual preparation processes themselves. This allows us to define interferometric measures which probe locality and correlation properties of spatially or temporally separated processes, and can be used to differentiate between processes that cannot be distinguished by direct process tomography using only the internal state of the particle.
KW - interferometry
KW - fidelity
KW - interference
KW - coherence measures
UR - http://dx.doi.org/10.1103/PhysRevLett.97.220404
U2 - 10.1103/PhysRevLett.97.220404
DO - 10.1103/PhysRevLett.97.220404
M3 - Article
VL - 97
JO - Physical Review Letters
T2 - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
M1 - 220404
ER -