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Three photons can display qualitatively new interference phenomena such as genuine three-photon interference. Here we show how to isolate three-photon interference with more than 90 % visibility, completely suppressing two-photon and single-photon interference.
Heralded single photon sources are the subject of intense research owing to their usefulness in metrology and quantum information. These are often created using a pair of photons produced by spontaneous parametric downconversion (SPDC), from which one photon is used to certify the presence of the other. However, multiple-pair production and detector dark counts limit the quality of such sources. Here,...
Using the building blocks of quantum optics — single photons, coherent states, beam splitters and projective measurement — we construct a two-mode quantum state for which coincident photon number terms in each mode are removed.
To implement the BB84 decoy-state quantum key distribution (QKD) protocol over a lossy ground-satellite quantum uplink requires a source that has high repetition rate of short laser pulses, long term stability, and no phase correlations between pulses. We present a new type of telecom optical polarization and amplitude modulator, based on a balanced Mach–Zehnder interferometer configuration, coupled...
Transmission losses limit quantum key distribution (QKD) to distances of only a few hundred kilometres. We investigate performance aspects of the QEYSSAT proposal to demonstrate global QKD using a microsatellite as a trusted quantum receiver.
We demonstrate quantum key distribution at total transmission losses up to 57 dB. We show this is sufficient for a satellite uplink, which benefits from the simplicity of the satellite receiver but is experimentally challenging.
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