The ideal wavelength for daylight free-space quantum key distribution

• URL: http://arxiv.org/abs/2303.02106v2
• Date: Tue, 12 Sep 2023 13:03:38 GMT
• Title: The ideal wavelength for daylight free-space quantum key distribution
• Authors: Mostafa Abasifard, Chanaprom Cholsuk, Roberto G. Pousa, Anand Kumar, Ashkan Zand, Thomas Riel, Daniel K. L. Oi, Tobias Vogl
• Abstract summary: We model a satellite-to-ground quantum channel for different quantum light sources to identify the optimal wavelength for free-space QKD in ambient conditions. Our results can be applied in roof-to-roof scenarios and are therefore relevant for near-future quantum networks.
• Score: 35.310629519009204
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum key distribution (QKD) has matured in recent years from laboratory proof-of-principle demonstrations to commercially available systems. One of the major bottlenecks is the limited communication distance in fiber networks due to the exponential signal damping. To bridge intercontinental distances, low Earth orbit satellites transmitting the quantum signals over the atmosphere can be used. These free-space links, however, can only operate during the night, as the sunlight otherwise saturates the detectors used to measure the quantum states. For applying QKD in a global quantum internet with continuous availability and high data rates, operation during daylight is required. In this work, we model a satellite-to-ground quantum channel for different quantum light sources to identify the optimal wavelength for free-space QKD in ambient conditions. Daylight quantum communication is possible within the Fraunhofer lines or in the near-infrared spectrum, where the intrinsic background from the sun is comparably low. The highest annual secret key length considering the finite key effect is achievable at the H\textalpha\ Fraunhofer line. More importantly, we provide the full model that can be adapted in general to any other specific link scenario. We also propose a true single-photon source based on a color center in hexagonal boron nitride coupled to a microresonator that can implement such a scheme. Our results can also be applied in roof-to-roof scenarios and are therefore relevant for near-future quantum networks.

Related papers

• Quantum interface for telecom frequency conversion based on diamond-type atomic ensembles [0.0]
  We study a quantum frequency conversion (QFC) mechanism using diamond-type four-wave mixing (FWM) with rubidium energy levels. By employing the reduced-density-operator theory, we demonstrate that this diamond-type FWM scheme maintains quantum characteristics with high fidelity. This work lays the essential groundwork for advancing the scheme in distributed quantum computing and long-distance quantum communication.
  arXiv  Detail & Related papers  (2024-01-18T07:36:30Z)
• Quantum Key Distribution Using a Quantum Emitter in Hexagonal Boron Nitride [48.97025221755422]
  We demonstrate a room temperature, discrete-variable quantum key distribution system using a bright single photon source in hexagonal-boron nitride. We have generated keys with one million bits length, and demonstrated a secret key of approximately 70,000 bits, at a quantum bit error rate of 6%. Our work demonstrates the first proof of concept finite-key BB84 QKD system realised with hBN defects.
  arXiv  Detail & Related papers  (2023-02-13T09:38:51Z)
• QUICK$^3$ -- Design of a satellite-based quantum light source for quantum communication and extended physical theory tests in space [73.86330563258117]
  Single photon source can enhance secure data rates in satellite-based quantum key distribution scenarios. payload is being integrated into a 3U CubeSat and scheduled for launch in 2024 into low Earth orbit.
  arXiv  Detail & Related papers  (2023-01-26T15:34:11Z)
• Daylight entanglement-based quantum key distribution with a quantum dot source [0.0]
  We implement a quantum communication protocol during daytime for the first time using a quantum dot source. This technology presents advantages in terms of narrower spectral bandwidth and negligible multiphoton emission at peak brightness.
  arXiv  Detail & Related papers  (2022-06-30T15:34:40Z)
• A CubeSat platform for space based quantum key distribution [62.997667081978825]
  We report on the follow-up mission of SpooQy-1, a 3U CubeSat that successfully demonstrated the generation of polarization-entangled photons in orbit. The next iteration of the mission will showcase satellite-to-ground quantum key distribution based on a compact source of polarization-entangled photon-pairs. We briefly describe the design of the optical ground station that we are currently building in Singapore for receiving the quantum signal.
  arXiv  Detail & Related papers  (2022-04-23T06:28:43Z)
• Efficient room-temperature molecular single-photon sources for quantum key distribution [51.56795970800138]
  Quantum Key Distribution (QKD) allows the distribution of cryptographic keys between multiple users in an information-theoretic secure way. We introduce and demonstrate a proof-of-concept QKD system exploiting a molecule-based single-photon source operating at room temperature and emitting at 785nm.
  arXiv  Detail & Related papers  (2022-02-25T11:52:10Z)
• Realizing quantum nodes in space for cost-effective, global quantum communication: in-orbit results and next steps [94.08853042978113]
  SpooQy-1 is a satellite developed at the Centre for Quantum Technologies. It has successfully demonstrated the operation of an entangled photon pair source on a resource-constrained CubeSat platform.
  arXiv  Detail & Related papers  (2021-04-22T02:59:23Z)
• Quantum Keyless Privacy vs. Quantum Key Distribution for Space Links [0.0]
  We study information theoretical security for space links between a satellite and a ground-station. We demonstrate information theoretical secure communication rates (positive keyless private capacity) over a classical-quantum wiretap channel.
  arXiv  Detail & Related papers  (2020-12-07T01:33:40Z)
• Quantum cryptography with highly entangled photons from semiconductor quantum dots [0.0]
  We report on the first implementation of the BBM92 protocol using a quantum dot source with an entanglement fidelity as high as 0.97(1). For a proof of principle, the key generation is performed between two buildings, connected by 350 metre long fiber, resulting in an average key rate of 135 bits/s and a qubit error rate of 0.019 over a time span of 13 hours.
  arXiv  Detail & Related papers  (2020-07-24T18:21:11Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.