Resource-effective Quantum Key Distribution: a field-trial in Padua city center

Abstract

Field-trials are of key importance for novel technologies seeking commercialization and wide-spread adoption. This is certainly also the case for Quantum Key Distribution (QKD), which allows distant parties to distill a secret key with unconditional security. Typically, QKD demonstrations over urban infrastructures require complex stabilization and synchronization systems to maintain a low Quantum Bit Error (QBER) and high secret key rates over time. Here we present a field-trial which exploits a low-complexity self-stabilized hardware and a novel synchronization technique, to perform QKD over optical fibers deployed in the city center of Padua, Italy. In particular, two techniques recently introduced by our research group are evaluated in a real-world environment: the iPOGNAC polarization encoder was used for the preparation of the quantum states, while the temporal synchronization was performed using the Qubit4Sync algorithm. The results here presented demonstrate the validity and robustness of our resource-effective QKD system, that can be easily and rapidly installed in an existing telecommunication infrastructure, thus representing an important step towards mature, efficient and low-cost QKD systems.

arXiv comment5 pages, 3 figures

References in corpus (14)

• Quantum Cryptography
• Quantum cryptography: Public key distribution and coin tossing
• The Security of Practical Quantum Key Distribution
• Secure quantum key distribution over 421 km of optical fiber
• Long term performance of the SwissQuantum quantum key distribution network in a field environment
• Secure heterodyne-based quantum random number generator at 17 Gbps
• Metropolitan quantum key distribution with silicon photonics
• Ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength-division multiplexing clock synchronization
• Patterning-effect-free intensity modulator for secure decoy-state quantum key distribution
• Fast and simple qubit-based synchronization for quantum key distribution
• Low Cost and Compact Quantum Cryptography
• All-fiber self-compensating polarization encoder for Quantum Key Distribution
• Security proof of a three-state quantum key distribution protocol without rotational symmetry
• Stable, low-error and calibration-free polarization encoder for free-space quantum communication

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