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A Study on the plug and play quantum key distribution network

  • 우민기 (아주대학교 일반대학원)

초록/요약

The commercialization of quantum key distribution (QKD), which enables secure communication even in the era of quantum computers, has acquired significant interest. Many QKD studies have been conducted, and now QKD is actively expanding point -to-point system to network architecture. Up to date, a wavelength division multiplexing (WDM) architecture has successfully expanded the number of channels. On the other hand, the PnP QKD structure has a great advantage in the stability of the system. In this paper, we propose a QKD network using PnP QKD structure. We also propose a polarization division multiplexing (PDM) method that increases user channels independently of wavelength for the network. Channel capacity can be increased rapidly by combining PDM and WDM. This method can be used in combination with WDM to rapidly increase channel capacity. Meanwhile, In a QKD system, a decoy-state protocol is an indispensable protocol that must be implemented for preventing potential quantum attacks. In this paper, we proposed a method for generating decoy pulses through amplification using an optical amplifier. The proposed scheme is suitable for PnP QKD by operating regardless of the input signal polarization. Finally, we propose a new scheme that can overcome the low key generation rate of PnP QKD. This study proposes a new method that can eliminate the SL by realizing an optical pulse train generator based on an optical cavity structure. Our method allows Alice to generate optical pulse trains herself by duplicating Bob’s seed pulse and excludes the need for Bob’s strong signal pulses that trigger backscattering noise as much as the conventional PnP QKD. Accordingly, our method can naturally overcome the miniaturization limitation and the slow secure key rate, as the storage line is no longer necessary.

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목차

Chapter 1: Introduction 1
1.1 Quantum key distribution (QKD) 2
1.1.1 The foundation of QKD's safety 2
1.1.2 BB84 protocol 4
1.1.3 Decoy state method 7
1.2 Implementation of fiber-based QKD 9
1.2.1 Mach-Zehnder interferometer 9
1.2.2 One-way QKD 11
1.2.3 Plug and play (two-way) QKD 12
1.3 Applied research 13
Chapter 2: PnP QKD network system using polarization-wavelength division multiplexing 15
2.1 Introduction 15
2.2 Quantum key distribution network system 17
2.2.1 Plug and Play QKD Network System Architecture 19
2.2.2 Server (Bob) 19
2.2.3 Clients (Alices) 22
2.3 Experiments 23
2.3.1 Polarization and wavelength characteristics of fibers 23
2.3.2 Alice's PM driving 25
2.3.3 Interference result of QKD network channel by Alice PM operation 27
2.3.4 Interference result of QKD network channel by Bob PM operation 28
2.3.5 QKD network system test in the deployed commercial network 30
2.4 Conclusion 33
Chapter 3: Generate decoy pulses by amplification 35
3.1 Introduction 35
3.2 PnP QKD decoy System with Amplification Structure 37
3.2.1. Polarization independent optical amplifier 38
3.2.2. Attenuation issues and output pulse Monitering 41
3.3 Experiment result 41
3.3.1. Double amplification method verification 41
3.3.2. Pulse intensity control experiment 43
3.3.3. Interference visibility 44
3.3.4. PnP QKD decoy System verification 45
3.4 Conclusions 46
Chapter 4: PnP QKD architecture with self-optical pulse train generator 47
4.1 Introduction 47
4.2 Proposed PnP QKD architecture with an optical pulse train generator 48
4.2.1. System architecture 48
4.2.2. Key Generation simulation of one-way, PnP and OPTG type 51
4.2.3. OPTG implementation 54
4.2.4. Phase encoding 56
4.3 Experimental result 57
4.3.1. Generation of pulse using OPTG 57
4.3.2. Interference visibility 58
4.3.3. Key rate and QBER for PnP QKD system with OPTG 59
4.4 Conclusion 60
Chapter 5: Conclusion 62
5.1 Future works 63
References 64

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