Single-photon Interference over 150 km Transmission Using Silica-based Integrated-optic Interferometers for Quantum Cryptography

Kimura, T.; Nambu, Yasusada; Hatanaka, Takaaki; Tomita, Akira; Kosaka, Hideo; Nakamura, Kazuo

doi:10.1143/jjap.43.l1217

Cited by 96 publications

(66 citation statements)

References 11 publications

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“…By applying a planar lightwave circuit (PLC), the instability due to the phase drift inherent in a one-way QKD system and the polarization drift in the link fiber were eliminated without introducing 4 any complex active compensation mechanisms. We showed that this system is sufficiently stable and has the potential to enlarge the key distribution distance by demonstrating singlephoton interference over 150 km [29]. In this paper, we report on the QKD system using this PLC-based interferometer and on our demonstration of key distribution over distances up to 100 km in the laboratory.…”

Section: Michelson Interferometer and Faraday Mirrors To Develop An Imentioning

confidence: 87%

“…An alternative approach to the aforementioned problems based on a one-way interferometer using integrated-optic AMZIs [26][27][28][29] was recently reported. By applying a planar lightwave circuit (PLC), the instability due to the phase drift inherent in a one-way QKD system and the polarization drift in the link fiber were eliminated without introducing 4 any complex active compensation mechanisms.…”

Section: Michelson Interferometer and Faraday Mirrors To Develop An Imentioning

confidence: 99%

“…The details of the interferometer are in ref. [29]. The AMZIs, which are 4.9 × 8.9 cm 2 , were fabricated on a silica-based PLC platform [30].…”

Section: Plc-based One-way Qkd Systemmentioning

confidence: 99%

“…The slight decrease in the measured ratio might be due to the quite slow and independent temperature drift in the two AMZIs. In addition, our interferometer can be made insensitive to polarization drift in the optical link [29]. Because double pulses with the same polarization enter Bob's apparatus, balancing the birefringence of the two arms in Bob's AMZI suffices for polarization insensitivity.…”

Section: Basic Performance Of Plc-based Interferometermentioning

confidence: 99%

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One-Way Quantum Key Distribution System Based on Planar Lightwave Circuits

Nambu

Yoshino

Tomita³

2006

jjap

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We developed a one-way quantum key distribution (QKD) system based upon a planar lightwave circuit (PLC) interferometer. This interferometer is expected to be free from the backscattering inherent in commercially available two-way QKD systems and phase drift without active compensation. A key distribution experiment with spools of standard telecom fiber showed that the bit error rate was as low as 6% for a 100-km key distribution using an attenuated laser pulse with a mean photon number of 0.1 and was determined solely by the detector noise. This clearly demonstrates the advantages of our PLC-based one-way QKD system over two-way QKD systems for long distance key distribution.

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Section: Michelson Interferometer and Faraday Mirrors To Develop An Imentioning

confidence: 87%

Section: Michelson Interferometer and Faraday Mirrors To Develop An Imentioning

confidence: 99%

“…The details of the interferometer are in ref. [29]. The AMZIs, which are 4.9 × 8.9 cm 2 , were fabricated on a silica-based PLC platform [30].…”

Section: Plc-based One-way Qkd Systemmentioning

confidence: 99%

Section: Basic Performance Of Plc-based Interferometermentioning

confidence: 99%

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One-Way Quantum Key Distribution System Based on Planar Lightwave Circuits

Nambu

Yoshino

Tomita³

2006

jjap

Self Cite

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“…6 Since any information will be encoded on these single or EPR photons in QKD, generation of single photons or ''entangled'' EPR photon pairs is a fundamental requirement for an implementation of QKD based on BB84 1, 2 and E91 5, 7 protocols, respectively. At present, weak coherent pulse (WCP) [8][9][10][11][12][13][14][15][16] and entangled photons generated by nonlinear optical processes such as spontaneous parametric downconversion (SPDC) [17][18][19][20][21] are used as light sources, both of which provide photons in coherent state. Thus, inherent photon number fluctuation is inevitable, and photon generation essentially becomes probabilistic.…”

Section: Introductionmentioning

confidence: 99%

Deterministic Single-Photon and Polarization-Correlated Photon Pair Generations From a Single InAlAs Quantum Dot

Kumano¹,

Kimura²,

Endo³

et al. 2006

Journal of Nanoelectronics and Optoelectronics

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Photon emission with nonclassical photon statistics is discussed with a single InAlAs quantum dot. The deterministic single-photon generation in which the emitted photon wavelength matches well to the highly sensitive wavelength region of highly efficient, low-noise Si-single-photon detectors and also to an atmospheric transmission window is demonstrated. Competing transition processes between neutral and charged exciton species originating from an exclusive formation in the same single quantum dot are clarified. It was found that suppressing the charged exciton formation is possible by a quasi-resonant excitation for a deterministic monochromatic single-photon generation. Polarizationdependent photoluminescence spectroscopy clearly indicates the preservation of photon polarizations between photons emitted by biexciton/exciton recombinations. Furthermore, the deterministic polarization-correlated photon pair generation with biexciton-exciton cascaded transition occurring in a single quantum dot is directly confirmed by the polarized second-order photon correlation measurements. This indicates a longer polarization flip time than the exciton lifetime, which is an essential requirement for the deterministic Einstein-Podolsky-Rosen photon pair generation under the present biexciton-exciton cascaded transition scheme.

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Optimal Settings for Amplification and Estimation Of Small Effects In Postselected Ensembles

Rostom

2021

Annalen der Physik

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To describe the pre-and postselected quantum ensembles, a complex quantity called the weak value of an operator is used. The weak value is highly controversial due to the fact that it is not bounded by the possible eigenvalues of the corresponding operator. Nevertheless, the obtaining of the anomalous weak value is regarded as a powerful technique in the quantum interferometry nowadays. Here it is shown that the postselection of a quantum system recovers a completely hidden interference effect in the measurement apparatus. Studying the interference pattern shows the optimal settings for the amplification and the parameter estimation. It also proves that the weak value is not an element of reality. Using single photons, it is investigated how a postselected photon can impart a 𝝅 phase shift (the peak of the amplification) to a photon interacting weakly with it in a nonlinear optical medium. The increasing of the degree of the entanglement lies behind the effectiveness of the postselection in the parameter estimation. In particular, arranging to postselect on pure entangled states can optimize the signal-to-noise ratio, allowing to achieve high-sensitive measurements using low input power.

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Single-photon Interference over 150 km Transmission Using Silica-based Integrated-optic Interferometers for Quantum Cryptography

Cited by 96 publications

References 11 publications

One-Way Quantum Key Distribution System Based on Planar Lightwave Circuits

One-Way Quantum Key Distribution System Based on Planar Lightwave Circuits

Deterministic Single-Photon and Polarization-Correlated Photon Pair Generations From a Single InAlAs Quantum Dot

Optimal Settings for Amplification and Estimation Of Small Effects In Postselected Ensembles

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