Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 108-115 |
| Seitenumfang | 8 |
| Fachzeitschrift | Laser & Photonic Reviews |
| Jahrgang | 10 |
| Ausgabenummer | 1 |
| Publikationsstatus | Veröffentlicht - 2016 |
| Extern publiziert | Ja |
Abstract
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Physik und Astronomie (insg.)
- Atom- und Molekularphysik sowie Optik
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in: Laser & Photonic Reviews, Jahrgang 10, Nr. 1, 2016, S. 108-115.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Light on a Beam Splitter: More Randomness with Single Photons
AU - Oberreiter, Lukas
AU - Gerhardt, Ilja
N1 - Publisher Copyright: © 2016 WILEY-VCH Verlag GmbH & Co. KGaA.
PY - 2016
Y1 - 2016
N2 - One of the most fundamental quantum random number generators is implemented with light impinging onto a beam splitter, and two single photon detectors at its output. Often, this generator is described as "a photon which takes one or the other path towards a detector". The input state of light in conjunction with the detector response is relevant for the amount, the pattern and the correlation of the generated clicks. Only a fraction of all generator outcomes, the min-entropy, can be used as a further resource for true randomness. This paper addresses the difference in the common description with incoming single photons and the often implemented scheme with a weak coherent light source, such as an attenuated laser. For this very fundamental and widely used configuration the amount of usable entropy is compared: If single photons from an anti-bunched light-source are supplied, the amount of entropy is higher than for the case of a supplied coherent state - although the latter can be arbitrarily bright unlike the single photon source. Furthermore, we can show that the use of a single photon emitter makes an injection of external information by an adversary into the device extremely challenging.
AB - One of the most fundamental quantum random number generators is implemented with light impinging onto a beam splitter, and two single photon detectors at its output. Often, this generator is described as "a photon which takes one or the other path towards a detector". The input state of light in conjunction with the detector response is relevant for the amount, the pattern and the correlation of the generated clicks. Only a fraction of all generator outcomes, the min-entropy, can be used as a further resource for true randomness. This paper addresses the difference in the common description with incoming single photons and the often implemented scheme with a weak coherent light source, such as an attenuated laser. For this very fundamental and widely used configuration the amount of usable entropy is compared: If single photons from an anti-bunched light-source are supplied, the amount of entropy is higher than for the case of a supplied coherent state - although the latter can be arbitrarily bright unlike the single photon source. Furthermore, we can show that the use of a single photon emitter makes an injection of external information by an adversary into the device extremely challenging.
KW - Quantum Randomness
KW - Single Photon Detection
KW - Single Photons
KW - Avalanche Photodiodes
KW - Waiting time distributions
KW - Entropy
KW - Quantum states of light
KW - Hanbury Brown and Twiss
KW - Photon statistics
KW - Single photons
KW - Quantum randomness
UR - http://www.scopus.com/inward/record.url?scp=84954394400&partnerID=8YFLogxK
U2 - 10.1002/lpor.201500165
DO - 10.1002/lpor.201500165
M3 - Article
VL - 10
SP - 108
EP - 115
JO - Laser & Photonic Reviews
JF - Laser & Photonic Reviews
IS - 1
ER -