333 research outputs found
Frequency and temporal effects in linear optical quantum computing
Typically linear optical quantum computing (LOQC) models assume that all
input photons are completely indistinguishable. In practice there will
inevitably be non-idealities associated with the photons and the experimental
setup which will introduce a degree of distinguishability between photons. We
consider a non-deterministic optical controlled-NOT gate, a fundamental LOQC
gate, and examine the effect of temporal and spectral distinguishability on its
operation. We also consider the effect of utilizing non-ideal photon counters,
which have finite bandwidth and time response.Comment: 10 pages, 9 figures, replaced with published versio
Modeling photo-detectors in quantum optics
Photo-detection plays a fundamental role in experimental quantum optics and
is of particular importance in the emerging field of linear optics quantum
computing. Present theoretical treatment of photo-detectors is highly idealized
and fails to consider many important physical effects. We present a physically
motivated model for photo-detectors which accommodates for the effects of
finite resolution, bandwidth and efficiency, as well as dark-counts and
dead-time. We apply our model to two simple well known applications, which
illustrates the significance of these characteristics.Comment: 8 pages, 7 figure
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