Full polarization control for fiber optical quantum communication systems using polarization encoding

Xavier, G. B.; Faria, G. Vilela de; Temporão, Guilherme P.; Weid, J. P. von der

doi:10.1364/oe.16.001867

Cited by 111 publications

(78 citation statements)

References 5 publications

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“…Note that the use of a fiber with the ps/km for a distance equal to 16 km will double (from 2.1% to 4%) the QBER value obtained for 8.4 km. This is in agreement with the experimental results reported in [9] and [12]. Indeed, ours results show that the loss of correlation between reference and data signals due to the increment of distance cannot be compensated with an improved WDM based SOP control system.…”

Section: B Qber Modelsupporting

confidence: 93%

“…When the contribution is small, the PMD coefficient plays an important role if we aim to increase the length of the quantum channel. Assuming for instance a fiber length equal to 8.4 km and a ps/km (values corresponding to the experimental conditions reported in [9]), the QBER given by (14) takes the value 2.1%, whereas assuming a fiber length equal to 16 km and a ps/km (values corresponding to the experimental conditions reported in [12]) the QBER takes the value 0.6%. Note that the use of a fiber with the ps/km for a distance equal to 16 km will double (from 2.1% to 4%) the QBER value obtained for 8.4 km.…”

Section: B Qber Modelmentioning

confidence: 99%

“…This means that the SOP changes can be reversed by compensating two non-orthogonal SOPs [10], [16], [17]. An active full polarization control scheme using two classical signals at different wavelengths is reported in [9] and [12]. The SOP control can also be performed using the same wavelength for both reference and data signals.…”

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confidence: 99%

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QBER Estimation in QKD Systems With Polarization Encoding

Muga

Ferreira

Pinto

2011

J. Lightwave Technol.

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Abstract-A model for quantum BER estimation in polarization encoded quantum key distribution systems is presented. Both TDM and WDM based polarization control schemes are analyzed. It is shown that TDM presents some important advantages when compared with the WDM control scheme. In WDM, the polarization decorrelation between the reference and data signals is an intrinsic and very limitative impairment. This effect has a contribution to quantum BER that increases with the propagation distance, and is highly dependent on the fiber polarization mode dispersion. In the TDM control scheme, the polarization decorrelation is less critical and other issues, like the single photon detector and feedback polarization control system performance tend to dominate. We show that for long distances the fiber losses represent the main contribution to the total quantum BER. Nevertheless, for distances shorter than 70 km and frequencies higher than 5 MHz the after pulse detections provide an important contribution to the total quantum BER.Index Terms-Optical fiber communication, optical fiber polarization, quantum communication.

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Section: B Qber Modelsupporting

confidence: 93%

Section: B Qber Modelmentioning

confidence: 99%

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QBER Estimation in QKD Systems With Polarization Encoding

Muga

Ferreira

Pinto

2011

J. Lightwave Technol.

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“…The key generation rate of the counterfactual QKD, which was mainly limited by the slow response time of the polarization rotators used in our experiment, could be increased with fast polarization rotators and high-speed single-photon detectors [27,28]. And the active polarization compensating methods have been invented for long-distance fiber-based QKD experiments [29][30][31], which were quite useful to realize a long-term stable and long-distance counterfactual QKD system. The counterfactual QKD scheme was implemented with currently available technologies, promising a robust and practical quantum cryptography system toward global secure communication.…”

mentioning

confidence: 98%

Experimental demonstration of counterfactual quantum key distribution

Ren

et al. 2011

Laser Phys.

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Counterfactual quantum key distribution provides natural advantage against the eavesdropping on the actual signal particles. It can prevent the photon-number-splitting attack when a weak coherent light source is used for the practical implementation. We realized the counterfactual quantum key distribution in an unbalanced Mach-Zehnder interferometer of 12.5-km-long quantum channel with a high-fringe visibility of 96.4%. As a result, we obtained secure keys against the noise-induced attack (eg. the vacuum attack) and passive photon-number-splitting attack.PACS numbers: 03.67.Dd Quantum key distribution (QKD) provides an unconditionally secure communication between two remote parties (Alice and Bob), where the security is guaranteed by the fundamentals of quantum mechanics [1,2]. However, current techniques cannot support to implement the ideal quantum cryptography experiment as originally proposed due to the lack of efficient single-photon or entangled photon-pair sources in the near-infrared region. So far, in practical long-distance fiber-based QKD systems, weak coherent light sources have been used instead of ideal single photons [3][4][5]. Intelligent methods have been invented to prevent the photon-numbersplitting (PNS) attack based on the multi-photon pulse of the weak coherent light source [6][7][8][9]. Among them, the decoy-state QKD protocol [10][11][12] could prevent the PNS attack by statistical security analysis of a large yield of the photon clicks [13,14]. On the other hand, quantum counterfactual effect has been discussed in interactionfree measurement [15][16][17] and developed for the quantum computation [18][19][20]. Recently, an interesting counterfactual QKD protocol was proposed [21] to distribute secret keys without any secret information-carrier qubits transmitting in the quantum channel, which can in principle prevent the eavesdropper to directly access the entire quantum system of each qubit. For example, secret key can be established by using the quantum counterfactual effect in a Michelson interferometer between Alice and Bob. One arm of the interferometer is in Alice's secure site, and the other arm is used to connect Bob as the quantum channel. Unlike previous QKD protocols which generate secret keys by transmitting the signal particles through the actual quantum channel, the proposed counterfactual QKD generates secret keys in the case that the photonic qubits only transmit in Alice's arm but never travel through the quantum channel to Bob. Interestingly, as a weak coherent light source is used, the quantum counterfactual effect provides a natural advantage to prevent the PNS attack by avoiding Eve's access to the information-carrier photons. Experimental demonstra- * Electronic address: gwu@phy.ecnu.edu.cn † Electronic address: hpzeng@phy.ecnu.edu.cn tion of such a counterfactual QKD requires a stabilized Michelson interferometer [22].In this letter, we experimentally demonstrate the counterfactual QKD based on a round-way unbalanced MachZehnder interferometer with 25 km fiber lengt...

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“…Depending on whether it halts the quantum photon transmitting procedure, most of these strategies can be divided into two types, the interrupting scheme [5,[10][11][12] and the real-time scheme [13][14][15]. The former will apparently sacrifice the efficiency of the system.…”

mentioning

confidence: 99%

Polarization-basis tracking scheme for quantum key distribution using revealed sifted key bits

Ding¹,

Chen²,

Chen³

et al. 2017

Opt. Lett.

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Calibration of the polarization basis between the transmitter and receiver is an important task in quantum key distribution (QKD). An effective polarization-basis tracking scheme will decrease the quantum bit error rate (QBER) and improve the efficiency of a polarization encoding QKD system. In this paper, we proposed a polarization-basis tracking scheme using only unveiled sifted key bits while performing error correction by legitimate users, rather than introducing additional reference light or interrupting the transmission of quantum signals. A polarization-encoding fiber BB84 QKD prototype was developed to examine the validity of this scheme. An average QBER of 2.32% and a standard derivation of 0.87% have been obtained during 24 hours of continuous operation.

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Full polarization control for fiber optical quantum communication systems using polarization encoding

Cited by 111 publications

References 5 publications

QBER Estimation in QKD Systems With Polarization Encoding

QBER Estimation in QKD Systems With Polarization Encoding

Experimental demonstration of counterfactual quantum key distribution

Polarization-basis tracking scheme for quantum key distribution using revealed sifted key bits

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