Polarization insensitive phase modulator for quantum cryptosystems

Qi, Bing; Huang, Le Hui; Lo, Hoi-Kwong; Qian, Li

doi:10.1364/oe.14.004264

Cited by 19 publications

(7 citation statements)

References 22 publications

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“…Moreover, the laser located on Charlie's station is shared by Alice and Bob, to guarantee the matched global phase. The Sagnac 28 or Sagnac-like 29 interferometers have been exploited in QKD systems previously. It is similar to the "plug-and-play" system that has been widely used in QKD 30,31 in which photons travel bidirectionally, though information is carried only in one direction.…”

Section: Experimental Set-upmentioning

confidence: 99%

Proof-of-principle experimental demonstration of twin-field quantum key distribution over optical channels with asymmetric losses

et al. 2021

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Twin-field (TF) quantum key distribution (QKD) is highly attractive because it can beat the fundamental limit of secret key rate for point-to-point QKD without quantum repeaters. Many theoretical and experimental studies have shown the superiority of TFQKD in long-distance communication. All previous experimental implementations of TFQKD have been done over optical channels with symmetric losses. But in reality, especially in a network setting, the distances between users and the middle node could be very different. In this paper, we perform a proof-of-principle experimental demonstration of TFQKD over optical channels with asymmetric losses. We compare two compensation strategies, that are (1) applying asymmetric signal intensities and (2) adding extra losses, and verify that strategy (1) provides much better key rate. Moreover, the higher the loss, the more key rate enhancement it can achieve. By applying asymmetric signal intensities, TFQKD with asymmetric channel losses not only surpasses the fundamental limit of key rate of point-to-point QKD for 50 dB overall loss, but also has key rate as high as 2.918 × 10−6 for 56 dB overall loss. Whereas no keys are obtained with strategy (2) for 56 dB loss. The increased key rate and enlarged distance coverage of TFQKD with asymmetric channel losses guarantee its superiority in long-distance quantum networks.

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Section: Experimental Set-upmentioning

confidence: 99%

Proof-of-principle experimental demonstration of twin-field quantum key distribution over optical channels with asymmetric losses

et al. 2021

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“…In [2] the scheme proposed is a phase modulation based on frequency shifters, which consists of an acousto-optic modulator (AOM), followed by a fiber. In [3] and [4] LiNbO3 waveguide-based phase modulator and gain-transparent semiconductor optical amplifier (GT-SOA) are used, respectively, as optical phase modulators.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a phase modulator using an active interferometric device

Dionísio

Reis

Andre

et al. 2010

Melecon 2010 - 2010 15th IEEE Mediterranean Electrotechnical Conference

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Abstract-A novel architecture for an optical phase modulator is presented and experimentally demonstrated. This approach relies on a commercially available integrated MachZehnder interferometer structure with Semiconductor Optical Amplifiers (MZI-SOA) and it is based in cross-phase modulation effect (XPM). The feasibility of the proposed optical phase modulator is experimentally investigated using different scenarios of input power and bit rates.

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“…The polarization sensitive modulator is effective in the vertical direction [18]. When light is oriented along the incident direction, a phase of expiΦ is added to the V Ψ component.…”

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confidence: 99%

Experimental single qubit quantum secret sharing in a fiber network configuration

Wei

Yang

2013

Opt. Lett.

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We present a robust single-photon quantum secret sharing (QSS) scheme with phase encoding in three-party implementations and a design way of more parties over a 50 km single-mode fiber network using a single QSS protocol. This scheme automatically provides perfect compensation for birefringence. A high visibility of 99.4% is obtained over three hours in visibility and stability measurements without any system adjustments, showing good potential for practical systems. Furthermore, polarization-insensitive phase modulators are realized using this system.

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Polarization insensitive phase modulator for quantum cryptosystems

Cited by 19 publications

References 22 publications

Proof-of-principle experimental demonstration of twin-field quantum key distribution over optical channels with asymmetric losses

Proof-of-principle experimental demonstration of twin-field quantum key distribution over optical channels with asymmetric losses

Experimental study of a phase modulator using an active interferometric device

Experimental single qubit quantum secret sharing in a fiber network configuration

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