Interferometer and method for controlling the coalescence of a pair of photons
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United States of America Patent
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Mar 8, 2016
Grant Date -
Jul 11, 2013
app pub date -
Jul 6, 2012
filing date -
Jul 8, 2011
priority date (Note) -
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Abstract
An interferometer for controlling the coalescence of a pair of photons, including: an optical source, which generates a first and a second pump pulse coherent with each other and shifted in time by a delay; and a first interferometric stage, which receives the first pump pulse and generates an antisymmetric state with two coalescent photons (1/√{square root over (2)}(|21,02−|01,22
)). The interferometer also includes a second interferometric stage, which receives the second pump pulse and generates a symmetric state with two coalescent photons (1/√{square root over (2)}·(|21,02
+|01,22
)), 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/√{square root over (2)}·(|21,02
+|01,22
)+eiτ·1/√{square root over (2)}·(|21,02
−|01,22
)), the weights of the sum being a function of the delay.
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