Single Photon Randomness based on a Defect Center in Diamond
- URL: http://arxiv.org/abs/2007.07522v1
- Date: Wed, 15 Jul 2020 07:43:16 GMT
- Title: Single Photon Randomness based on a Defect Center in Diamond
- Authors: Xing Chen and Johannes Greiner and J\"org Wrachtrup and Ilja Gerhardt
- Abstract summary: A single photon impinges onto a beam splitter and is then detected by single photon detectors at one of the two output paths.
When the two output modes are observed by a single photon detector, the generated clicks can be interpreted as ones and zeros.
We implement such a random bit generator based on single photons from a defect center in diamond.
- Score: 1.0677593299861892
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The prototype of a quantum random number generator is a single photon which
impinges onto a beam splitter and is then detected by single photon detectors
at one of the two output paths. Prior to detection, the photon is in a quantum
mechanical superposition state of the two possible outcomes with - ideally -
equal amplitudes until its position is determined by measurement. When the two
output modes are observed by a single photon detector, the generated clicks can
be interpreted as ones and zeros - and a raw random bit stream is obtained.
Here we implement such a random bit generator based on single photons from a
defect center in diamond. We investigate the single photon emission of the
defect center by an anti-bunching measurement. This certifies the "quantumness"
of the supplied photonic input state, while the random "decision" is still
based on the vacuum fluctuations at the open port of the beam-splitter.
Technical limitations, such as intensity fluctuations, mechanical drift, and
bias are discussed. A number of ways to suppress such unwanted effects, and an
a priori entropy estimation are presented. The single photon nature allows for
a characterization of the non-classicality of the source, and allows to
determine a background fraction. Due to the NV-center's superior stability and
optical properties, we can operate the generator under ambient conditions
around the clock. We present a true 24/7 operation of the implemented random
bit generator.
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