Analysis of detector performance in a gigahertz clock rate quantum key distribution system

Clarke, Patrick J.; Collins, Robert J.; Hiskett, Philip A.; García-Martínez, María-José; Krichel, Nils J.; McCarthy, Aongus; Tanner, Michael G.; O’Connor, John A.; Natarajan, Chandra M.; Miki, Shigehito; Sasaki, Masahide; Wang, Zhen; Fujiwara, Mikio; Rech, Ivan; Ghioni, M.; Gulinatti, Angelo; Hadfield, Robert H.; Townsend, Paul D.; Buller, Gerald S.

doi:10.1088/1367-2630/13/7/075008

Cited by 32 publications

(34 citation statements)

References 40 publications

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“…The Si-SPADs have an asymmetric temporal response profile, exhibiting a Gaussian leading edge but a series of exponential decays on the falling edge. 31 The record of raw detector event times is filtered to remove any events occurring outside of 2 ns duration window centered on the expected arrival time of the pulse. The FW1%M of the temporal response profile of the detector 31 is 1.5 ns, ensuring that this filtering window retains the majority of the counts while filtering undesired counts between expected pulse arrival periods.…”

Section: Experimental Systemmentioning

confidence: 99%

An in fiber experimental approach to photonic quantum digital signatures that does not require quantum memory

Collins

Donaldon

Dunjko

et al. 2014

Emerging Technologies in Security and Defence II; And Quantum-Physics-Based Information Security III

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Classical digital signatures are commonly used in e-mail, electronic financial transactions and other forms of electronic communications to ensure that messages have not been tampered with in transit, and that messages are transferrable. The security of commonly used classical digital signature schemes relies on the computational difficulty of inverting certain mathematical functions. However, at present, there are no such one-way functions which have been proven to be hard to invert. With enough computational resources certain implementations of classical public key cryptosystems can be, and have been, broken with current technology. It is nevertheless possible to construct information-theoretically secure signature schemes, including quantum digital signature schemes. Quantum signature schemes can be made informationtheoretically secure based on the laws of quantum mechanics, while classical comparable protocols require additional resources such as secret communication and a trusted authority.Early demonstrations of quantum digital signatures required quantum memory, rendering them impractical at present. Our present implementation is based on a protocol that does not require quantum memory. It also uses the new technique of unambiguous quantum state elimination, Here we report experimental results for a test-bed system, recorded with a variety of different operating parameters, along with a discussion of aspects of the system security.

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Section: Experimental Systemmentioning

confidence: 99%

An in fiber experimental approach to photonic quantum digital signatures that does not require quantum memory

Collins

Donaldon

Dunjko

et al. 2014

Emerging Technologies in Security and Defence II; And Quantum-Physics-Based Information Security III

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“…To maximize range of transmission, it is important that quantum key distribution systems are compatible with the widely deployed telecommunications optical fiber network, which usually necessitates employing photon sources which emit at wavelengths close to 1.3 or 1.55 μm [4] -hence, high-efficiency single-photon detectors operating at these wavelengths are desirable. The precise operating characteristics of the single-photon detectors play an important role in the rate of the key exchange process, and small changes in the performance of the detectors can affect the final secure information exchange rate to a surprising extent [5].…”

Section: Introductionmentioning

confidence: 99%

“…There will be a statistical deviation in the individual measurements of timing jitter, and it is often quoted as the full width at halfmaximum (FWHM) of a histogram of the distribution, although full width at tenth-maximum (FW10M) and full width at hundredth-maximum (FW100M) are also sometimes used [5].…”

Section: Introductionmentioning

confidence: 99%

Single-Photon Detectors for Infrared Wavelengths in the Range 1–1.7 μm

Buller¹,

Collins²

2014

Springer Series on Fluorescence

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The ongoing progress of scientific research in areas such as quantum communications, low-light level laser ranging, and material science (to name but a few) has led to increased interest in the detection of single photons in the wavelength range 1-1.7 μm. Several technologies have been used to detect photons with wavelengths in this range -each with different characteristic parameters that affect their suitability for specific applications. This chapter will provide a review of progress in the development of detectors for use in this spectral region and will highlight some notable results.

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“…Indeed, while InGaAs single-photon detectors have greatly improved their performance in terms of the maximum repetition rate they can operate at (from megahertz to gigahertz) [14], they are still outperformed by commercially available Si single-photon detectors (Si-SPADs) in critical parameters, such as dark-count rate, detection efficiency, and afterpulse probability. Likewise, superconducting single-photon detectors, although exhibiting low timing jitters and dark-count rates at λ ∼ 850 nm [15], still exhibit lower detection efficiencies than Si-SPADs, and must be cooled down to temperatures as low as 3 K. Therefore, a source wavelength of λ ∼ 850 nm in conjunction with Si-SPADs as the single-photon detectors was chosen as the most efficient and practical solution to achieve gigahertz clock rates [16].…”

Section: Introductionmentioning

confidence: 99%

High-speed free-space quantum key distribution system for urban daylight applications

et al. 2013

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We report a free-space quantum key distribution system designed for high-speed key transmission in urban areas. Clocking the system at gigahertz frequencies and efficiently filtering background enables higher secure key rates than those previously achieved by similar systems. The transmitter and receiver are located in two separate buildings 300 m apart in downtown Madrid and they exchange secure keys at rates up to 1 Mbps. The system operates in full bright daylight conditions with an average secure key rate of 0.5 Mbps and 24 h stability without human intervention.

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Analysis of detector performance in a gigahertz clock rate quantum key distribution system

Cited by 32 publications

References 40 publications

An in fiber experimental approach to photonic quantum digital signatures that does not require quantum memory

An in fiber experimental approach to photonic quantum digital signatures that does not require quantum memory

Single-Photon Detectors for Infrared Wavelengths in the Range 1–1.7 μm

High-speed free-space quantum key distribution system for urban daylight applications

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