High-speed tomography of time-bin-entangled photons using a single-measurement setting

S. X. Wang*, C. Chan, P. Moraw, D. R. Reilly, J. B. Altepeter, Gregory Scott Kanter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We generate time-bin entangled photons and measure the resulting quantum state with a tomography system that uses asymmetric interferometers having 3×3 output couplers. This configuration allows for measurements to be made simultaneously in all bases that are required for tomographic reconstruction. By eliminating the burden of tuning interferometer phases and by measuring all the spatial and temporal modes, substantial improvements in measurement speed are observed. Raw fidelities of 84% with respect to an ideal entangled state are measured in about 2 s using a 12-MHz entangled state generator, with corresponding accidental count subtracted fidelities exceeding 90%.

Original languageEnglish (US)
Article number042122
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number4
StatePublished - Oct 25 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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