Abstract
Time-bin encoding is a robust form of optical quantum information, especially for transmission in optical fibers. To readout the information, the separation of the time bins must be larger than the detector time resolution, typically on the order of nanoseconds for photon counters. In the present work, we demonstrate a technique using a nonlinear interaction between chirped entangled time-bin photons and shaped laser pulses to perform projective measurements on arbitrary time-bin states with picosecond-scale separations. We demonstrate a tomographically complete set of time-bin qubit projective measurements and show the fidelity of operations is sufficiently high to violate the Clauser-Horne-Shimony-Holt-Bell inequality by more than 6 standard deviations.
- Received 29 May 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.153602
© 2013 American Physical Society
Viewpoint
It’s a Good Time for Time-Bin Qubits
Published 9 October 2013
Qubits encoded in time advance the prospects for quantum computing with single photons.
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