Model for optimizing quantum key distribution with continuous-wave pumped entangled-photon sources

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14610%2F21%3A00122150" target="_blank" >RIV/00216224:14610/21:00122150 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/pra/abstract/10.1103/PhysRevA.104.022406" target="_blank" >https://journals.aps.org/pra/abstract/10.1103/PhysRevA.104.022406</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.104.022406" target="_blank" >10.1103/PhysRevA.104.022406</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Model for optimizing quantum key distribution with continuous-wave pumped entangled-photon sources

Popis výsledku v původním jazyce

Quantum key distribution (QKD) allows unconditionally secure communication based on the laws of quantum mechanics rather than assumptions about computational hardness. Optimizing the operation parameters of a given QKD implementation is indispensable in order to achieve high secure key rates. So far, there exists no model that accurately describes entanglement-based QKD with continuous-wave pump lasers. We analyze the underlying mechanisms for QKD with temporally uniform pair-creation probabilities and develop a simple but accurate model to calculate optimal tradeoffs for maximal secure key rates. In particular, we find an optimization strategy of the source brightness for given losses and detection-time resolution. All experimental parameters utilized by the model can be inferred directly in standard QKD implementations, and no additional assessment of device performance is required. Comparison with experimental data shows the validity of our model. Our results yield a tool to determine optimal operation parameters for already existing QKD systems, to plan a full QKD implementation from scratch, and to determine fundamental key rate and distance limits of given connections.

Název v anglickém jazyce

Model for optimizing quantum key distribution with continuous-wave pumped entangled-photon sources

Popis výsledku anglicky

Quantum key distribution (QKD) allows unconditionally secure communication based on the laws of quantum mechanics rather than assumptions about computational hardness. Optimizing the operation parameters of a given QKD implementation is indispensable in order to achieve high secure key rates. So far, there exists no model that accurately describes entanglement-based QKD with continuous-wave pump lasers. We analyze the underlying mechanisms for QKD with temporally uniform pair-creation probabilities and develop a simple but accurate model to calculate optimal tradeoffs for maximal secure key rates. In particular, we find an optimization strategy of the source brightness for given losses and detection-time resolution. All experimental parameters utilized by the model can be inferred directly in standard QKD implementations, and no additional assessment of device performance is required. Comparison with experimental data shows the validity of our model. Our results yield a tool to determine optimal operation parameters for already existing QKD systems, to plan a full QKD implementation from scratch, and to determine fundamental key rate and distance limits of given connections.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical review A

ISSN

2469-9926

e-ISSN

2469-9934

Svazek periodika

104

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

022406

Kód UT WoS článku

000681426600003

EID výsledku v databázi Scopus

2-s2.0-85112365250