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Schematic of the QRNG setup. A DFB cw laser attenuated approximately to the single photon level impinges upon an InGaAs APD. The APD is biased at a dc level of and a superimposed a square wave modulation of amplitude and frequency fo which drives the device above breakdown. The resulting signal is sent through a self-differencing circuit, to remove the capacitive response, before being amplified and then finally sent to time tagging single photon counting electronics.
A histogram of the photon detections in individual clock cycles from the QRNG setup under cw illumination.
(a) Results of the NIST statistical tests on patterns of binary bits from the quantum RNG. All tests are passed at the significance level. (b) The proportion of passes of each NIST test for the streams.
(a) Results of the DIEHARD statistical tests on a block of pattern of binary bits from the QRNG. All tests are passed at the significance level from the to . (b) Byte correlation plot of the pattern.
Calculation depicting the self-differencing count rate of the detector (solid line) and the experimentally measured self-differencing output (squares) as a function of the product of photon flux and detector efficiency for a clock frequency of .
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