| 摘要 |
A high-efficiency generator for generating pairs of photons, having a type-one crystal (3) receiving a laser pump beam at the input and generating pairs of photons of like polarization at the output; a first and a second polarization at the output; a first and a second polarization at the rotator (20a, 20b), which respectively receive the photons in each generated pair; a beam splitter (17), which reflects one polarization at its inputs, and transmits the other polarization; and conveying mirrors for directing the photons from the first and second polarization rotator (20a, 20b) to the inputs of the beam splitter (17). The state of the photons at the outputs of the beam splitter (17) has a Bell state which may be used, for example, in a quantum cryptography process. |
