Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation

Xavier, G. B.; Walenta, Nino; Faria, G. Vilela de; Temporão, Guilherme P.; Gisin, Nicolas; Zbinden, Hugo; Weid, J. P. von der

doi:10.1088/1367-2630/11/4/045015

Cited by 83 publications

(62 citation statements)

References 24 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%

“…The total error rate can be written as (11) where represents the error rate contribution due to the frequency decorrelation between reference and data SOPs, and represents the contribution due to dark counts. The contribution due to the decorrelation is given by (12) where is the probability of a photon to be detected in the wrong detector, given by (8). The contribution is given by [1] …”

Section: B Qber Modelmentioning

confidence: 99%

“…The implementation of QKD protocols (for instance BB84 [2], or B92 [6]) can be performed encoding quantum bits into the polarization of individual photons [1], [7]. In order to make polarization encoding feasible, both time division multiplexing (TDM) and wavelength division multiplexing (WDM) based polarization control schemes have been proposed in the literature [7]- [12].…”

mentioning

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.…”

mentioning

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%

Section: B Qber Modelmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

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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Active polarization control for quantum communication in long‐distance optical fibers with shared telecom traffic

Xavier

Faria

Silva

et al. 2011

Micro & Optical Tech Letters

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a combination of radiated susceptibility plus conducted susceptibility. Sensors with cables of ECG equipments are so sensitive and open to be distorted. These induced current is then driving through electronics by conduction mechanisms. CONCLUSIONSABSTRACT: We experimentally demonstrate the compatibility of wavelength multiplexed active polarization stabilization for quantum communication in an optical fiber carrying telecom traffic. One of the feedback control channels contains a 9.953 Gb/s datastream generated from a BER meter. We verify the ability to transmit single-photons in the two opposite directions of a 23-km optical fiber spool, while maintaining their state of polarization stable and a classical BER in the feedback channel error-free, during 6 h of continuous operation.ABSTRACT: This letter deals with a GaAs monolithic microwave integrated circuit (MMIC) Doherty power amplifier (DPA) for X-band systems. To the best of authors' knowledge, it represents the first DPA realization in the X-band frequency range. Experimental results showed a 30-dBm saturated output power and a drain efficiency greater than 53% at 9.5 GHz. Moreover, in the 6-dB power back-off (from 18 to 24 dBm input power), an amplitude modulation (AM/AM) distortion lower than 1 dB is also demonstrated with an average efficiency greater than 50%.

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Analysis for Satellite‐Based High‐Dimensional Extended B92 and High‐Dimensional BB84 Quantum Key Distribution

Dutta,

Muskan,

Banerjee

et al. 2024

Adv Quantum Tech

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A systematic analysis of the advantages and challenges associated with the satellite‐based implementation of the high dimensional extended B92 (HD‐Ext‐B92) and high‐dimensional BB84 (HD‐BB84) protocol is analyzed. The method used earlier for obtaining the key rate for the HD‐Ext‐B92 is modified here and subsequently the variations of the key rate, probability distribution of key rate (PDR), and quantum bit error rate (QBER) with respect to dimension and noise parameter of a depolarizing channel is studied using the modified key rate equation. Further, the variations of average key rate (per pulse) with zenith angle and link length in different weather conditions in day and night considering extremely low noise for dimension are investigated using elliptic beam approximation. The effectiveness of the HD‐(extended) protocols used here in creating satellite‐based quantum key distribution links (both up‐link and down‐link) are established by appropriately modeling the atmosphere and analyzing the variation of average key rates with the probability distribution of the transmittance (PDT). The analysis performed here has revealed that in higher dimensions, HD‐BB84 outperforms HD‐Ext‐B92 in terms of both key rate and noise tolerance. However, HD‐BB84 experiences a more pronounced saturation of QBER in high dimensions.

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Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation

Cited by 83 publications

References 24 publications

QBER Estimation in QKD Systems With Polarization Encoding

QBER Estimation in QKD Systems With Polarization Encoding

Active polarization control for quantum communication in long‐distance optical fibers with shared telecom traffic

Analysis for Satellite‐Based High‐Dimensional Extended B92 and High‐Dimensional BB84 Quantum Key Distribution

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