| 摘要 |
The invention provides an apparatus and method for time delaying different polarization components of a signal (1) relative to one another, comprising a polarization signal splitter (2) which splits first and second polarization components of an input signal into a first component signal (11) and a second component signal (12) such that said first component signal propagates along a first path and the second component signal propagates along a second path, wherein said first component signal reaches a location (5) relative to when said second component reaches said location at times differing by a delayed time, and use of the apparatus in a communication system. The apparatus may be used for quantum cryptography, to convert a sender's polarization-qubit signal into a signal appropriate for channels and receivers based on phase-encoded schemes. |
