Demonstration of a 6 state-4 state reference frame independent channel for quantum key distribution

Tannous, Ramy; Ye, Zhangdong; Jin, Jeongwan; Kuntz, Katanya B.; Lütkenhaus, Norbert; Jennewein, Thomas

doi:10.1063/1.5125700

Cited by 20 publications

(12 citation statements)

References 29 publications

(35 reference statements)

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“…In the first example, we apply our method to the entanglement-based BB84 protocol with an ideal entangled photon source. In the second example, we provide a finite key analysis of six-state four-state protocol [27]. We use both these two examples to demonstrate the effectiveness of our method, compare performances of two algorithms and compare two versions of the EAT (smoothed min-entropy versus sandwiched Rényi entropy).…”

Section: Examplesmentioning

confidence: 99%

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Finite-Key Analysis of Quantum Key Distribution with Characterized Devices Using Entropy Accumulation

George¹,

J²,

Himbeeck³

et al. 2022

Preprint

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The Entropy Accumulation Theorem (EAT) was introduced to significantly improve the finite-size rates for device-independent quantum information processing tasks such as device-independent quantum key distribution (QKD). A natural question would be whether it also improves the rates for device-dependent QKD. In this work, we provide an affirmative answer to this question. We present new tools for applying the EAT in the device-dependent setting. We present sufficient conditions for the Markov chain conditions to hold as well as general algorithms for constructing the needed min-tradeoff function. Utilizing Dupuis' recent privacy amplification without smoothing result, we improve the key rate by optimizing the sandwiched Rényi entropy directly rather than considering the traditional smooth min-entropy. We exemplify these new tools by considering several examples including the BB84 protocol with the qubit-based version and with a realistic parametric downconversion source, the six-state four-state protocol and a high-dimensional analog of the BB84 protocol.

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Section: Examplesmentioning

confidence: 99%

“…We then apply our method to several examples. The first example is a simple qubit-based BB84 protocol and the second example is the entanglement-based six-state four-state protocol [27]. We use these two examples to demonstrate behaviors of our algorithms.…”

Section: Introductionmentioning

confidence: 99%

Finite-Key Analysis of Quantum Key Distribution with Characterized Devices Using Entropy Accumulation

George¹,

J²,

Himbeeck³

et al. 2022

Preprint

Self Cite

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“…Beacons can be used to provide alignment information, e.g a linearly polarised laser allows the receiver to compensate for any relative rotation around the line of sight direction. If the change in alignment is slow, reference frame independent protocols can be used to eliminate the need for such alignment steps [283,284]. In CV QKD protocols, the reference frame (local oscillator phase) can be transferred in the form of a strong reference pulse that is transmitted along with the quantum signal (e.g.…”

Section: Timing and Synchronisationmentioning

confidence: 99%

Advances in Space Quantum Communications

Sidhu,

Joshi,

Gundogan

et al. 2021

Preprint

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Concerted efforts are underway to establish an infrastructure for a global quantum internet to realise a spectrum of quantum technologies. This will enable more precise sensors, secure communications, and faster data processing. Quantum communications are a front-runner with quantum networks already implemented in several metropolitan areas. A number of recent proposals have modelled the use of space segments to overcome range limitations of purely terrestrial networks. Rapid progress in the design of quantum devices have enabled their deployment in space for in-orbit demonstrations. We review developments in this emerging area of space-based quantum technologies and provide a roadmap of key milestones towards a complete, global quantum networked landscape. Small satellites hold increasing promise to provide a cost effective coverage required to realised the quantum internet. We review the state of art in small satellite missions and collate the most current in-field demonstrations of quantum cryptography. We summarise important challenges in space quantum technologies that must be overcome and recent efforts to mitigate their effects. A perspective on future developments that would improve the performance of space quantum communications is included. We conclude with a discussion on fundamental physics experiments that could take advantage of a global, space-based quantum network.

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“…We also make some variation on the classical DL04 protocol via introducing σ y basis checking measurement when carrying out the security checking phase while more general checking mode could be considered like having been shown in Ref. [31]. That is, in the modified protocol, DL04-6-state protocol, more information can be obtained from the check phase used to bound the adversary's knowledge of the state shared by Alice and Bob.…”

Section: Applications To Specific Examplesmentioning

confidence: 99%

Generic Security Analysis Framework for Quantum Secure Direct Communication

Ye¹,

Pan²,

Sun³

et al. 2020

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Quantum secure direct communication provides a direct means of conveying secret information via quantum states among legitimate users. The past two decades have witnessed its great strides both theoretically and experimentally. However, the security analysis of it still stays in its infant. Some practical problems in this field to be solved urgently, such as detector efficiency mismatch, side-channel effect and source imperfection, are propelling the birth of a more impeccable solution. In this paper, we establish a new framework of the security analysis driven by numerics where all the practical problems may be taken into account naturally. We apply this framework to several variations of the DL04 protocol considering real-world experimental conditions. Also, we propose two optimizing methods to process the numerical part of the framework so as to meet different requirements in practice. With these properties considered, we predict the robust framework would open up a broad avenue of the development in the field.

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Demonstration of a 6 state-4 state reference frame independent channel for quantum key distribution

Cited by 20 publications

References 29 publications

Finite-Key Analysis of Quantum Key Distribution with Characterized Devices Using Entropy Accumulation

Finite-Key Analysis of Quantum Key Distribution with Characterized Devices Using Entropy Accumulation

Advances in Space Quantum Communications

Generic Security Analysis Framework for Quantum Secure Direct Communication

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