Quantum cryptography on multi-user network architectures

Kumavor, Patrick D.; Beal, A.C.; Yelin, Susanne F.; Donkor, Eric; Wang, Bing C.

doi:10.1117/12.665651

Cited by 6 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first method physically routes the photon to the required node in a network. This is accomplished through the use of either active switching mechanisms [2] within the hardware layer of the network infrastructure, as demonstrated by the DARPA network, or wavelength division multiplexing (WDM) in a passive optical network [3]. Quantum networks have also been implemented by means of additional and modified network layers in the open system interconnection (OSI) network model.…”

Section: Introductionmentioning

confidence: 99%

Recent Findings From The Quantum Network in Durban

Mirza¹,

Petruccione²,

Ralph³

et al. 2011

AIP Conference Proceedings

View full text Add to dashboard Cite

The QuantumCity and QuantumStadium projects are aimed at developing and examining quantum-secured communication networks in a long-term, commercial environment. Many Quantum Key Distribution (QKD) experimental setups to date have failed to provide a long-term analysis of the systems as well as report on the robustness of the devices within an industrial context. The aforementioned projects provide an insight into these characteristics respectively. The projects are hosted within the eThekwini Municipality's fibre optic network. They securely connect relevant Municipal buildings, providing the client nodes with an option of quantumsecured communication. The QuantumCity initiative has deployed QKD solutions for almost 2 years while the QuantumStadium project ran for the duration of the 2010 FIFA World Cup.

show abstract

Section: Introductionmentioning

confidence: 99%

Recent Findings From The Quantum Network in Durban

Mirza¹,

Petruccione²,

Ralph³

et al. 2011

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Although promising progresses have been achieved by using active feedback control to stabilize the interferometer [8], the "plug & play" auto-compensating QKD structure employing a Faraday mirror has demonstrated higher performance in practice [9]. Like the "plug & play" system, the Sagnac loop also offers phase stability and polarization stability, as the two interfering signals travel through the same path, but its structure is in principle much simpler than the "plug & play" scheme [10][11][12][13]. However, all reported Sagnac QKD systems employed polarization-sensitive phase modulators, requiring complicated polarization controls, which makes this scheme unattractive.…”

Section: Introductionmentioning

confidence: 99%

Quantum key distribution based on a Sagnac loop interferometer and polarization-insensitive phase modulators

Huang

et al. 2006

2006 IEEE International Symposium on Information Theory

View full text Add to dashboard Cite

We present a design for a quantum key distribution (QKD) system in a Sagnac loop configuration, employing a novel phase modulation scheme based on frequency shift, and demonstrate stable BB84 QKD operation with high interference visibility and low quantum bit error rate (QBER). The phase modulation is achieved by sending two light pulses with a fixed time delay (or a fixed optical path delay) through a frequency shift element and by modulating the amount of frequency shift. The relative phase between two light pulses upon leaving the frequency-shift element is determined by both the time delay (or the optical path delay) and the frequency shift, and can therefore be controlled by varying the amount of frequency shift. To demonstrate its operation, we used an acousto-optic modulator (AOM) as the frequency-shift element, and vary the driving frequency of the AOM to encode phase information. The interference visibility for a 40km and a 10km fiber loop is 96% and 99%, respectively, at single photon level. We ran BB84 protocol in a 40-km Sagnac loop setup continuously for one hour and the measured QBER remained within the 2%∼5% range. A further advantage of our scheme is that both phase and amplitude modulation can be achieved simultaneously by frequency and amplitude modulation of the AOM's driving signal, allowing our QKD system the capability of implementing other protocols, such as the decoy-state QKD and the continuous-variable QKD. We also briefly discuss a new type of Eavesdropping strategy ("phaseremapping" attack) in bidirectional QKD system.

show abstract

“…Like the "plug & play" system, the Sagnac loop also offers phase stability and polarization stability, as the two interfering signals travel through the same path, but its structure is in principle much simpler than the "plug & play" scheme [10][11][12][13]. However, all reported Sagnac QKD systems employed polarization-sensitive phase modulators, requiring complicated polarization controls, which makes this scheme unattractive.…”

Section: Introductionmentioning

confidence: 99%

Polarization insensitive phase modulator for quantum cryptosystems

Qi¹,

Huang²,

Lo³

et al. 2006

Opt. Express

View full text Add to dashboard Cite

Abstract-We present a design for a quantum key distribution (QKD) system in a Sagnac loop configuration, employing a novel phase modulation scheme based on frequency shift, and demonstrate stable BB84 QKD operation with high interference visibility and low quantum bit error rate (QBER). The phase modulation is achieved by sending two light pulses with a fixed time delay (or a fixed optical path delay) through a frequency shift element and by modulating the amount of frequency shift. The relative phase between two light pulses upon leaving the frequency-shift element is determined by both the time delay (or the optical path delay) and the frequency shift, and can therefore be controlled by varying the amount of frequency shift. To demonstrate its operation, we used an acousto-optic modulator (AOM) as the frequency-shift element, and vary the driving frequency of the AOM to encode phase information. The interference visibility for a 40km and a 10km fiber loop is 96% and 99%, respectively, at single photon level. We ran BB84 protocol in a 40-km Sagnac loop setup continuously for one hour and the measured QBER remained within the 2%∼5% range. A further advantage of our scheme is that both phase and amplitude modulation can be achieved simultaneously by frequency and amplitude modulation of the AOM's driving signal, allowing our QKD system the capability of implementing other protocols, such as the decoy-state QKD and the continuous-variable QKD. We also briefly discuss a new type of Eavesdropping strategy ("phaseremapping" attack) in bidirectional QKD system.

show abstract

Quantum cryptography on multi-user network architectures

Cited by 6 publications

References 0 publications

Recent Findings From The Quantum Network in Durban

Recent Findings From The Quantum Network in Durban

Quantum key distribution based on a Sagnac loop interferometer and polarization-insensitive phase modulators

Polarization insensitive phase modulator for quantum cryptosystems

Contact Info

Product

Resources

About