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1550 nm Single-Photon Detection for the Demonstration of Unconditionally Secure Fiber-Optic Quantum Key Distribution over 50 km

Akio Yoshizawa, R. Kaji, Hidemi Tsuchida

IEICE Transactions on ElectronicsSep 1, 20031 citation

After-pulse-discarding in single-photon detection to reduce bit errors in quantum key distribution

Akio Yoshizawa, R. Kaji, Hidemi Tsuchida

We demonstrate fiber-optic quantum key distribution (QKD) at 1550 nm using single-photon detectors operating at 5 MHz. Such high speed single-photon detectors are essential to the realization of efficient QKD. However, after-pulses increase bit errors. In the demonstration, we discard after-pulses by measuring time intervals of detection events. For a fiber length of 10.5 km, we have achieved a key rate of 17 kHz with an error of 2%.

Optics ExpressJun 2, 200322 citations

Single-photon generation and detection for quantum key distribution at 1550 nm

直人行方

Jan 1, 20070 citations

10.5 km Fiber-Optic Quantum Key Distribution at 1550 nm with a Key Rate of 45 kHz

Akio Yoshizawa, Ryosaku Kaji, Hidemi Tsuchida

High-speed single-photon detectors are crucial for efficiently performing quantum key distribution. We demonstrate fiber-optic quantum key distribution at 1550 nm using single-photon detectors operating at 10 MHz. Discharge pulse counting is adopted for single-photon detection in order to suppress after-pulse generation. Furthermore, by setting a dead time in single-photon detection, we discard after-pulses to reduce the number of bit errors in the quantum key distribution. Using discharge pulse counting and after-pulse discarding in the quantum key distribution, we can achieve a key rate of 45 kHz with a bit-error rate of 2%. The fiber length is 10.5 km.High-speed single-photon detectors are crucial for efficiently performing quantum key distribution. We demonstrate fiber-optic quantum key distribution at 1550 nm using single-photon detectors operating at 10 MHz. Discharge pulse counting is adopted for single-photon detection in order to suppress after-pulse generation. Furthermore, by setting a dead time in single-photon detection, we discard after-pulses to reduce the number of bit errors in the quantum key distribution. Using discharge pulse counting and after-pulse discarding in the quantum key distribution, we can achieve a key rate of 45 kHz with a bit-error rate of 2%. The fiber length is 10.5 km.

Japanese Journal of Applied PhysicsMay 21, 200429 citations

Single-Photon Detectors for Quantum Key Distribution in 1550nm: Simulations and Experimental results

RAMOS R. V, GEORGE ANDRE' PEREIRA THE'

Jan 1, 20030 citations

Investigations on Long Wavelength Quantum Cryptography Systems

F. Gibson, Alexandru Hening, Mohamed Bourennane +4 more

Quantum cryptography is a technique for establishing a fundamentally secure key for cryptography using the encoding of the key on single photon states in such a way that an eavesdropper cannot acquire any information about the key without impairing detectable errors in the communication channel [1]. In the recent years there has been a remarkable progress in experimental implementations at 850 nm and 1300 nm wavelengths with secret key generation at kbits/s up to 48 km distance. However, for 1550 nm wavelength, where fiber losses are as smallest, progress has been hampered by the lack of good single photon detectors.Quantum cryptography is a technique for establishing a fundamentally secure key for cryptography using the encoding of the key on single photon states in such a way that an eavesdropper cannot acquire any information about the key without impairing detectable errors in the communication channel [1]. In the recent years there has been a remarkable progress in experimental implementations at 850 nm and 1300 nm wavelengths with secret key generation at kbits/s up to 48 km distance. However, for 1550 nm wavelength, where fiber losses are as smallest, progress has been hampered by the lack of good single photon detectors.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Jan 1, 19980 citations

1550 nm Single-Photon Detection for the Demonstration of Unconditionally Secure Fiber-Optic Quantum Key Distribution over 50 km( Recent Progress in Photon Detection Technology)

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1550 nm Single-Photon Detection for the Demonstration of Unconditionally Secure Fiber-Optic Quantum Key Distribution over 50 km( Recent Progress in Photon Detection Technology)

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