| 摘要 |
<p>An interferometer for controlling the coalescence of a pair of photons, including: an optical source (51,52), which generates a first and a second pump pulse coherent with each other and shifted in time by a delay (Ä); and a first interferometric stage (I a ), which receives the first pump pulse and generates an antisymmetric state with two coalescent photons 1 / 2 ( | 2 1 , 0 2 Œª - | 0 1 , 2 2 Œª . The interferometer also includes a second interferometric stage (I s ), which receives the second pump pulse and generates a symmetric state with two coalescent photons 1 / 2 ‹ | 2 1 , 0 2 Œª + | 0 1 , 2 2 Œª , the first and the second interferometric stages being connected in a manner such that the interferometer outputs a final state equal to a weighted sum of the antisymmetric state and of the symmetric state 1 / 2 ‹ | 2 1 , 0 2 Œª + | 0 1 , 2 2 Œª + e iÄ ‹ 1 / 2 ‹ �¢ | 2 1 , 0 2 Œª - | 0 1 , 2 2 Œª , the weights of the sum being a function of the delay.</p> |
