Overcoming the rate-distance limit of device-independent quantum key
distribution
- URL: http://arxiv.org/abs/2103.17135v2
- Date: Fri, 2 Apr 2021 15:56:46 GMT
- Title: Overcoming the rate-distance limit of device-independent quantum key
distribution
- Authors: Yuan-Mei Xie, Bing-Hong Li, Yu-Shuo Lu, Xiao-Yu Cao, Wen-Bo Liu,
Hua-Lei Yin, Zeng-Bing Chen
- Abstract summary: Device-independent quantum key distribution (DIQKD) exploits the violation of a Bell inequality to extract secure key.
We propose a heralded DIQKD scheme based on entangled coherent states to improve entangling rates.
- Score: 7.864517207531803
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Device-independent quantum key distribution (DIQKD) exploits the violation of
a Bell inequality to extract secure key even if the users' devices are
untrusted. Currently, all DIQKD protocols suffer from the secret key capacity
bound, i.e., the secret key rate scales linearly with the transmittance of two
users. Here we propose a heralded DIQKD scheme based on entangled coherent
states to improve entangling rates whereby long-distance entanglement is
created by single-photon-type interference. The secret key rate of our scheme
can significantly outperform the traditional two-photon-type Bell-state
measurement scheme and, importantly, surpass the above capacity bound. Our
protocol therefore is an important step towards a realization of DIQKD and can
be a promising candidate scheme for entanglement swapping in future quantum
internet.
Related papers
- Efficient Device-Independent Quantum Key Distribution [4.817429789586127]
Device-independent quantum key distribution (DIQKD) is a key distribution scheme whose security is based on the laws of quantum physics.
We propose an efficient device-independent quantum key distribution protocol in which one participant prepares states and transmits them to another participant.
arXiv Detail & Related papers (2023-11-16T13:01:34Z) - Reliable Quantum Communications based on Asymmetry in Distillation and Coding [35.693513369212646]
We address the problem of reliable provision of entangled qubits in quantum computing schemes.
We combine indirect transmission based on teleportation and distillation; (2) direct transmission, based on quantum error correction (QEC)
Our results show that ad-hoc asymmetric codes give, compared to conventional QEC, a performance boost and codeword size reduction both in a single link and in a quantum network scenario.
arXiv Detail & Related papers (2023-05-01T17:13:23Z) - Phase-Matching Quantum Key Distribution without Intensity Modulation [25.004151934190965]
We propose a phase-matching quantum key distribution protocol without intensity modulation.
Simulation results show that the transmission distance of our protocol could reach 305 km in telecommunication fiber.
Our protocol provides a promising solution for constructing quantum networks.
arXiv Detail & Related papers (2023-03-21T04:32:01Z) - High-Rate Point-to-Multipoint Quantum Key Distribution using Coherent
States [6.058240259980149]
Quantum key distribution (QKD) which enables information-theoretically security is now heading towards quantum secure networks.
It requires high-performance and cost-effective protocols while increasing the number of users.
Here, we show a 'protocol solution' using continuous-variable quantum information.
arXiv Detail & Related papers (2023-02-05T14:21:33Z) - Overcoming fundamental bounds on quantum conference key agreement [0.0]
Twin-Field Quantum Key Distribution (TF-QKD) enables two distant parties to establish a shared secret key.
TF-QKD is the only scheme capable of beating the repeaterless bound on the bipartite private capacity.
We propose a practical conference key agreement protocol that only uses WCPs and linear optics and prove its security with a multiparty decoy-state method.
arXiv Detail & Related papers (2022-11-28T17:09:41Z) - Conference key agreement in a quantum network [67.410870290301]
Quantum conference key agreement (QCKA) allows multiple users to establish a secure key from a shared multi-partite entangled state.
In a quantum network, this protocol can be efficiently implemented using a single copy of a N-qubit Greenberger-Horne-Zeilinger (GHZ) state to distil a secure N-user conference key bit.
arXiv Detail & Related papers (2022-07-04T18:00:07Z) - Upper bounds on key rates in device-independent quantum key distribution
based on convex-combination attacks [1.118478900782898]
We present the convex-combination attack as an efficient, easy-to-use technique for upper-bounding DIQKD key rates.
It allows verifying the accuracy of lower bounds on key rates for state-of-the-art protocols.
arXiv Detail & Related papers (2022-06-13T15:27:48Z) - Towards fully-fledged quantum and classical communication over deployed
fiber with up-conversion module [47.187609203210705]
We propose and demonstrate a new method, based on up-conversion assisted receiver, for co-propagating classical light and QKD signals.
Our proposal exhibits higher tolerance for noise in comparison to the standard receiver, thus enabling the distribution of secret keys in the condition of 4 dB-higher classical power.
arXiv Detail & Related papers (2021-06-09T13:52:27Z) - Path-encoded high-dimensional quantum communication over a 2 km
multicore fiber [50.591267188664666]
We demonstrate the reliable transmission over a 2 km long multicore fiber of path-encoded high-dimensional quantum states.
A stable interferometric detection is guaranteed, allowing for low error rates and the generation of 6.3 Mbit/s of secret key rate.
arXiv Detail & Related papers (2021-03-10T11:02:45Z) - Upper bounds on device-independent quantum key distribution [4.7840623105240585]
Device-independent quantum key distribution (DIQKD) is a version of QKD with a stronger notion of security.
We study the rate at which DIQKD can be carried out for a given bipartite quantum state distributed between the sender and receiver.
arXiv Detail & Related papers (2020-05-27T17:41:38Z) - Backflash Light as a Security Vulnerability in Quantum Key Distribution
Systems [77.34726150561087]
We review the security vulnerabilities of quantum key distribution (QKD) systems.
We mainly focus on a particular effect known as backflash light, which can be a source of eavesdropping attacks.
arXiv Detail & Related papers (2020-03-23T18:23:12Z)
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.