Demonstration of an Algorithm for Quantum State Generation in Polarization-Encoding QKD Systems

Mantey, Sara T.; Ramos, Mariana F.; Silva, N. A.; Pinto, Armando N.; Muga, Nelson J.

doi:10.1364/ofc.2022.m3i.3

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…The first step of the algorithm is to rotate the SOP until it is located on the maximum perimeter circle of the Poincaré sphere, as shown by the dark blue line in figure 3. This maximum perimeter circle is strategically chosen, given that from here, using only one waveplate, it is possible to generate all four SOP [24].…”

Section: The Polarization State Generation Algorithmmentioning

confidence: 99%

“…In this work, we expand the analysis of our recently proposed SOP generation method [24], towards the implementation of polarization-encoding QKD physical layers. This implementation comprises the automatic polarization calibration at the transmitter, a classical optical signal for the symbol synchronization, and a frame synchronization mechanism deployed at the receiver.…”

Section: Introductionmentioning

confidence: 99%

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Design and implementation of a polarization-encoding system for quantum key distribution

Mantey,

Silva,

Pinto

et al. 2024

J. Opt.

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We present the design and implementation of a state-of-polarization (SOP) management technique and two efficient synchronizing methods for quantum key distribution (QKD) systems. This is achieved following a wavelength-division multiplexing approach, where the classical synchronization signal and the quantum states are propagated in the same optical fiber. The employed frame synchronization method is based on the monitoring of the quantum bit error ratio (QBER) of the quantum channel, thus avoiding additional hardware and high computational resources. We evaluate the operation of SOP generation method through the assessment of the individual response of the waveplates that comprise the employed electronic polarization controller. Finally, the performance was assessed by computing the overall QBER and the QBER contributions of each of the four polarization states associated with the different qubits. The measurements, obtained during six hours, show a slight variation of the QBER values associated with the individual contributions, reaching an overall QBER of 0.75%. This demonstrates the capability of the presented methods to operate, stably, with very low QBER values, making its application in practical QKD systems reliable.

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Section: The Polarization State Generation Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and implementation of a polarization-encoding system for quantum key distribution

Mantey,

Silva,

Pinto

et al. 2024

J. Opt.

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“…The working principle of the above explained setup consists of two main parts: the finding of the maximum perimeter circle on the Poincaré sphere, and the determination of the voltages for each SOP. The operation principle of both branches of this SOP generation algorithm is to maximize and minimize the optical power at the entrance of the PIN by changing the voltage on the EPCs waveplates, following an algorithm detailed in [Mantey 2022].…”

Section: Transmitter Of the Qkd Systemmentioning

confidence: 99%

“…The quantum signal will carry the polarization states, for which a correct and efficient generation mechanism is needed. This State of Polarization (SOP) generation is achieved using an Electronic Polarization Controller (EPC) based on piezoelectric technology [Mantey 2022]. The other optical signal is used for synchronization purposes.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a Polarization-encoding Quantum Key Distribution System

Mantey

Ramos²,

Silva³

et al. 2022

Anais Do II Workshop De Comunicação E Computação Quântica (WQuantum 2022)

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In this work, a fully functional polarization-encoding quantum key distribution system (QKD) is demonstrated. At the transmitter side, the polarization states are prepared using an algorithm to determine the voltages to be applied on the electronic polarization controller (EPC), to generate up to four polarization states. At the receiver, a second EPC is used to perform the basis alignment. The symbol synchronization is achieved using a reference optical signal that is wavelength division multiplexed with the quantum signal which carries the polarization-encoded qubit. Frame synchronization is achieved at a protocol level. The presented QKD system works at a repetition rate of 500 Hz, with an average quantum bit error rate of 1.35%.

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Frame Synchronization for Quantum Key Distribution Systems

Mantey

Ramos

Silva

et al. 2022

GLOBECOM 2022 - 2022 IEEE Global Communications Conference

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Demonstration of an Algorithm for Quantum State Generation in Polarization-Encoding QKD Systems

Abstract: We experimentally demonstrate a polarization-state generation algorithm using off-the-shelf components. The method was implemented using a laboratory QKD testbed running for 21 hours with an average QBER of 1.8%.

Cited by 3 publications

References 6 publications

Design and implementation of a polarization-encoding system for quantum key distribution

Design and implementation of a polarization-encoding system for quantum key distribution

Demonstration of a Polarization-encoding Quantum Key Distribution System

Frame Synchronization for Quantum Key Distribution Systems

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