Polarisation control schemes for fibre-optics quantum communications using polarisation encoding

Faria, G. Vilela de; Ferreira, João Pedro; Xavier, G. B.; Temporão, Guilherme P.; Weid, J. P. von der

doi:10.1049/el:20083122

Cited by 5 publications

(7 citation statements)

References 4 publications

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“…Our proposal consists of a real-time continuous solution where the reference signals are separated in wavelength from the quantum signal, in order to achieve this goal. As was discussed in [19], there are three possible approaches: a) one control channel, containing both SOPs S 1 and S 3 , each with a different amplitude modulation frequency, easily split at the receiver through filtering (dithering); b) two separate control channels (one for each SOP) operating in continuous-wave mode (CW); and c) combining the solution from a) and b), that is, two separate control channels, each containing both states S 1 and S 3 through amplitude modulation, so that the mean value is taken. Method c) yields the best control performance, although it is more complex to implement.…”

Section: Control In Practicementioning

confidence: 90%

“…Good results were achieved even with a channel separation of 0.8 nm and a fibre mean group delay of 0.54 ps [18]. Simulations have shown that good control with the same channel separation on fibres with <τ> up to 1 ps are achievable [19], meaning that a good correlation exists between the SOP of the reference signals and of the quantum channel. Most QKD fibre spans (~100 km) have <τ> smaller than 1 ps.…”

Section: Control Theorymentioning

confidence: 99%

“…Method c) yields the best control performance, although it is more complex to implement. In this paper method b) is used, as it is simpler to implement, and it gives the same performance as method a) [19].…”

Section: Control In Practicementioning

confidence: 99%

See 2 more Smart Citations

Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation

et al. 2009

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We demonstrate an active polarization drift compensation scheme for optical fibres employed in a quantum key distribution experiment with polarization encoded qubits. The quantum signals are wavelength multiplexed in one fibre along with two classical optical side channels that provide the control information for the polarization compensation scheme. This setup allows us to continuously track any polarization change without the need to interrupt the key exchange. The results obtained show that fast polarization rotations of the order of 40 π rad/s are effectively compensated. We demonstrate that our setup allows continuous quantum key distribution even in a fibre stressed by random polarization fluctuations. Our results pave the way for Bell-state measurements using only linear optics with parties separated by long distance optical fibres.

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Section: Control In Practicementioning

confidence: 90%

Section: Control Theorymentioning

confidence: 99%

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Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation

et al. 2009

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“…We employ two side channels, one at a shorter, and the other at a longer wavelength than the quantum channel. They are also placed as close as possible to the quantum channel according to our simulations [10].…”

Section: The Experimentsmentioning

confidence: 99%

“…Our quantum channel was chosen to be placed at λ Q = 1546.12 nm. According to our simulations, a distance of 0.8 nm from the classical channels to the quantum channel will suffice for typical QKD transmission distances [10]. Therefore we used the immediate below and above channels in the grid, λ 1 = 1545.32 nm and λ 3 = 1546.92 nm respectively.…”

Section: The Experimentsmentioning

confidence: 99%

Stable polarization coded quantum communication through single mode optical fibers

Xavier¹,

Faria²,

Temporão³

et al. 2008

Anais Do XXVI Simpósio Brasileiro De Telecomunicações

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We perform a transmission of polarization encoded quantum bits through 16 km of single mode optical fiber in the 1550 nm window. The polarization drift caused by the changing birefringence of the fiber is kept stable through the use of a polarization control system we developed. This system employs 2 classical reference signals with 0.8 nm spacing from the quantum channel. We also send through the same fiber an extra reference classical signal used to trigger the single-photon detector. To the best of our knowledge this is the first time a quantum channel is multiplexed with 3 classical signals in the same optical fiber.

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Efficient and multifunctional terahertz polarization control device based on metamaterials*

Jiao

Zhang

et al. 2020

Chinese Phys. B

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Terahertz polarization devices are an important part of terahertz optical systems. Traditional terahertz polarization devices rely on birefringent crystals, and their performances are limited by the material structures. In this work, we theoretically demonstrate that the metamaterial consisting of the medium and the periodic metal band embedded in the medium can control broadband polarization effectively. The transmission length of the subwavelength waveguide mode gives rise to a broadband transmission peak. The resonant cavity structure formed by the dielectric layer and the waveguide layer possesses a high transmission efficiency. By optimizing the metamaterial structure parameters, we design a high-efficient (>90%) quarter-wave plate over a frequency range of 0.90 THz–1.10 THz and a high-efficient (>90%) half-wave plate over a frequency range of 0.92 THz–1.02 THz. Besides, due to the anisotropy of the structure, the metamaterials with the same structural parameters can achieve the function of the polarized beam splitting with an efficiency of up to 99% over a frequency range of 0.10 THz–0.55 THz. Therefore, the designed metamaterial has a multifunctional polarization control effect, which has potential applications in the terahertz integrated polarization optical system.

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Polarisation control schemes for fibre-optics quantum communications using polarisation encoding

Cited by 5 publications

References 4 publications

Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation

Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation

Stable polarization coded quantum communication through single mode optical fibers

Efficient and multifunctional terahertz polarization control device based on metamaterials*

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