Open AccessMapping between multi-photon polarization state and single-photon spatial qudit and its applications
Author(s) -
Qing Lin
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.084209
Subject(s) - photon , physics , unitary transformation , photon polarization , quantum computer , unitary state , qubit , operator (biology) , quantum optics , quantum mechanics , quantum , biochemistry , chemistry , repressor , political science , transcription factor , law , gene
Based on a special controlled-NOT gate, a multi-photon state encoded in polarizations of photons could be transformed into the corresponding single photon qudit encoded in spatial mode. It will make the processing on multi-photon change into the operation on a single-photon, if the inverse transformation from a single photon qudit back to a multi-photon state could be realized also. Associated with linear optical multi-port interferometer for single-photon unitary operation, the positive-operator value measurement and the universal unitary operation for multi-photon state are realized. This approach is more efficient than the previous one with decomposition into two-qubit gates in the circuit-based quantum computation, and it is feasible with using the current experimental technology.