Tracking capacitance of liquid crystal devices to improve polarization rotation accuracy

Chandrasekara, Rakhitha; Durak, Kadir; Ling, Alexander

doi:10.1364/oe.25.020363

Cited by 5 publications

(3 citation statements)

References 9 publications

(11 reference statements)

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“…The latter is either power hungry or waveguide-based and extremely lossy even with small pointing errors due to the necessity of coupling into the waveguide. Our mission design overcomes the above limitations by using a relatively slow (response times t SB ≈ 100 μs [58]) liquid crystal half wave plate (LC-HWP) [59] similar to those on board the Singaporean quantum CubeSat [19]. The security of the Q.Com link can be maintained by only considering the first detection event after each random basis choice and discarding the rest.…”

Section: Basis Choice and Polarization Analysismentioning

confidence: 99%

Q3Sat: quantum communications uplink to a 3U CubeSat—feasibility & design

Neumann

Joshi

Fink

et al. 2018

EPJ Quantum Technol.

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Satellites are the most efficient way to achieve global scale quantum communication (Q.Com) because unavoidable losses restrict fiber based Q.Com to a few hundred kilometers. We demonstrate the feasibility of establishing a Q.Com uplink with a 3U CubeSat, measuring only 10 × 10 × 34 cm 3 , using commercial off-the-shelf components, the majority of which have space heritage. We demonstrate how to leverage the latest advancements in nano-satellite body-pointing to show that our 4 kg CubeSat can generate a quantum-secure key, which has so far only been shown by a much larger 600 kg satellite mission. A comprehensive link budget and simulation was performed to calculate the secure key rates. We discuss design choices and trade-offs to maximize the key rate while minimizing the cost and development needed. Our detailed design and feasibility study can be readily used as a template for global scale Q.Com.

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Section: Basis Choice and Polarization Analysismentioning

confidence: 99%

Q3Sat: quantum communications uplink to a 3U CubeSat—feasibility & design

Neumann

Joshi

Fink

et al. 2018

EPJ Quantum Technol.

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show abstract

“…The latter is either power hungry or waveguidebased and extremely lossy even with small pointing errors due to the necessity of coupling into the waveguide. Our mission design overcomes the above limitations by using a relatively slow (response times t SB ≈100 µs [52]) liquid crystal half wave plate (LC-HWP) [53] similar to those on board the Singaporean quantum Cube-Sat [16]. The security of the Q.Com link can be maintained by only considering the first detection event after each random basis choice and discarding the rest.…”

Section: The Cubesatmentioning

confidence: 99%

Quantum Communication Uplink to a 3U CubeSat: Feasibility & Design

Neumann,

Joshi,

Fink

et al. 2017

Preprint

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Satellites are the most efficient way to achieve global scale quantum communication (Q.Com) because unavoidable losses restrict fiber based Q.Com to a few hundred kilometers. We demonstrate the feasibility of establishing a Q.Com uplink with a tiny 3U CubeSat (measuring just 10×10×32 cm 3 ) using commercial off-the-shelf components, the majority of which have space heritage. We demonstrate how to leverage the latest advancements in nano-satellite body-pointing to show that our 4 kg CubeSat can provide performance comparable to much larger 600 kg satellite missions. A comprehensive link budget and simulation was performed to calculate the secure key rates. We discuss design choices and trade-offs to maximize the key rate while minimizing the cost and development needed. Our detailed design and feasibility study can be readily used as a template for global scale Q.Com.

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“…Satellite-to-ground QKD and a quantumsecured video conference between Beijing and Vienna were carried out with the "Micius" satellite in 2017 [12][13][14] . These groundbreaking results have spurred an international enthu-siasm for applications of space-based quantum communications [15][16][17][18][19][20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Portable ground stations for space-to-ground quantum key distribution

Ren¹,

Abulizi²,

Yong³

et al. 2022

Preprint

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Quantum key distribution (QKD) uses the fundamental principles of quantum mechanics to share unconditionally secure keys between distant users. Previous works based on the quantum science satellite "Micius" have initially demonstrated the feasibility of a global QKD network. However, the practical applications of space-based QKD still face many technical problems, such as the huge size and weight of ground stations required to receive quantum signals. Here, we report space-to-ground QKD demonstrations based on portable receiving ground stations. The weight of the portable ground station is less than 100 kg, the space required is less than 1 m 3 and the installation time requires no more than 12 hours, all of the weight, required space and deployment time are about two orders of magnitude lower than those for the previous systems. Moreover, the equipment is easy to handle and can be placed on the roof of buildings in a metropolis. Secure keys have been successfully generated from the "Micius" satellite to these portable ground stations at six different places in China, and an average final secure key length is around 50 kb can be obtained during one passage. Our results pave the way for, and greatly accelerate the practical application of, space-based QKD.

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Tracking capacitance of liquid crystal devices to improve polarization rotation accuracy

Cited by 5 publications

References 9 publications

Q3Sat: quantum communications uplink to a 3U CubeSat—feasibility & design

Q3Sat: quantum communications uplink to a 3U CubeSat—feasibility & design

Quantum Communication Uplink to a 3U CubeSat: Feasibility & Design

Portable ground stations for space-to-ground quantum key distribution

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