A directly phase-modulated light source

Abstract

The art of imparting information onto a light wave by optical signal modulation is fundamental to all forms of optical communication. Among many schemes, direct modulation of laser diodes stands out as a simple, robust, and cost effective method. However, the simultaneous changes in intensity, frequency and phase are a drawback which has prevented its application in the field of secure quantum communication. Here, we propose and experimentally demonstrate a directly phase-modulated light source which overcomes the main disadvantages associated with direct modulation and is suitable for diverse applications such as coherent communications and quantum cryptography. The source separates the tasks of phase preparation and pulse generation between a pair of semiconductor lasers leading to very pure phase states. Moreover, the cavity enhanced electro-optic effect enables the first example of sub-volt halfwave phase modulation at high signal rates. The source is compact, stable and versatile, and we show its potential to become the standard transmitter for future quantum communication networks.

arXiv comment14 pages, 4 figures

References in corpus (23)

• Quantum Cryptography
• Decoy State Quantum Key Distribution
• Quantum Key Distribution with High Loss: Toward Global Secure Communication
• Beating the PNS attack in practical quantum cryptography
• Secure Quantum Key Distribution
• Field test of quantum key distribution in the Tokyo QKD Network
• Practical Decoy State for Quantum Key Distribution
• Quantum cryptography with finite resources: unconditional security bound for discrete-variable protocols with one-way post-processing
• A quantum access network
• Fast and simple one-way Quantum Key Distribution
• Field and long-term demonstration of a wide area quantum key distribution network
• Quantum cryptography without detector vulnerabilities using optically-seeded lasers
• Measurement-device-independent quantum key distribution over untrustful metropolitan network
• Efficient decoy-state quantum key distribution with quantified security
• Loss-tolerant quantum cryptography with imperfect sources
• Time-bin entangled photons from a quantum dot
• Practical quantum key distribution over a 48-km optical fiber network
• Security of differential phase shift quantum key distribution against individual attacks
• Robust random number generation using steady-state emission of gain-switched laser diodes
• Experimental quantum key distribution with source flaws
• Continuous operation of a one-way quantum key distribution system over installed telecom fibre
• Proof-of-Concept of Real-World Quantum Key Distribution with Quantum Frames
• Sub-Volt Silicon-Organic Electrooptic Modulator

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• Self-Tuning Transmitter for Quantum Key Distribution Using Machine Intelligence
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