Improved measurement-device-independent quantum key distribution with uncharacterized qubits

Hwang, Won-Young; Su, Hong-Yi; Bae, Joonwoo

doi:10.1103/physreva.95.062313

Cited by 20 publications

(23 citation statements)

References 12 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the encoding devices in practical systems, such as polarization modulators and phase modulators, inevitably introduce modulation errors. Here, with the three-intensity decoy-state method [37], we generalize the improved MDI-QKD with uncharacterized qubits [32] to the more practical weak coherent sources (WCS). A schematic setup is shown in Fig.…”

Section: Improved Three-intensity Decoy-state Mdi-qkd With Uncharactementioning

confidence: 99%

“…Later on, this method was further investigated in [30], [31]. Recently, Hwang et al gave an improved bound based on Yin et al's work by deriving a more precise estimation of the phase-error rate [32]. However, Hwang et al's work only considered the case of using the single-photon source, which cannot be implemented in practice.…”

Section: Introductionmentioning

confidence: 99%

“…[33] which employs the decoy-state method [34]- [37] to make the original MDI-QKD protocol more practical, we generalize the work in Ref. [32] to a more practical scenario, where practical sources with the aid of the decoy-state method can be used in MDI-QKD with uncharacterized encoding. Unlike previous decoy-state MDI-QKD works [33], [38]- [40], our work makes fewer request on the source.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improved Decoy-State Measurement-Device-Independent Quantum Key Distribution With Imperfect Source Encoding

et al. 2019

View full text Add to dashboard Cite

Measurement-device-independent quantum key distribution (MDI-QKD) is designed to be secure against any detector-side channel attacks. However, assumption of characterized sources in preparation is a demanding requirement and can not be fully satisfied in real-life implementations. Luckily, by utilizing the data of mismatched bases, the system can even generate secure keys with uncharacterized sources. Here, we give a framework on investigating the practical performance of an improved MDI-QKD with uncharacterized sources, where the three-intensity decoy-state method is employed and full parameter optimizations are applied. Simulation results show that the improved method can significantly enhance the performance compared with the original MDI-QKD with uncharacterized sources.

show abstract

Section: Improved Three-intensity Decoy-state Mdi-qkd With Uncharactementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved Decoy-State Measurement-Device-Independent Quantum Key Distribution With Imperfect Source Encoding

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Bell nonlocality of quantum measurements is a deeply studied topic in quantum theory, with several applications in various device-independent protocols [49][50][51][52], randomness generation and randomness expansion [53,54] and others, for a recent review on Bell nonlocality see [55].…”

Section: Bell Nonlocality Of Quantum Channelsmentioning

confidence: 99%

Conditions for the compatibility of channels in general probabilistic theory and their connection to steering and Bell nonlocality

Plávala¹

2017

Phys. Rev. A

View full text Add to dashboard Cite

We derive general conditions for the compatibility of channels in general probabilistic theory. We introduce formalism that allows us to easily formulate steering by channels and Bell nonlocality of channels as generalizations of the well-known concepts of steering by measurements and Bell nonlocality of measurements. The generalization does not follow the standard line of thinking stemming from the Einstein-Podolsky-Rosen paradox, but introduces steering and Bell nonlocality as entanglement-assisted incompatibility tests. We show that all of the proposed definitions are, in the special case of measurements, the same as the standard definitions, but not all of the known results for measurements generalize to channels. For example, we show that for quantum channels, steering is not a necessary condition for Bell nonlocality. We further investigate the introduced conditions and concepts in the special case of quantum theory and we provide many examples to demonstrate these concepts and their implications.

show abstract

“…This, in fact, is a form of measurement-device independence [25][26][27], and is a direct consequence of the monogamy of entanglement: if Alice and Bob share an entangled state of high fidelity, then Eve must be disentangled from this state. As a result of this, Alice and Bob need not trust the source of entanglement.…”

Section: Introductionmentioning

confidence: 99%

Photonic hybrid state entanglement swapping using cat state superpositions

Parker

Joo²,

Spiller

2020

Proc. R. Soc. A.

View full text Add to dashboard Cite

We propose the use of hybrid entanglement in an entanglement swapping protocol, as means of distributing a Bell state with high fidelity to two parties. The hybrid entanglement used in this work is described as a discrete variable (Fock state) and a continuous variable (cat state super- position) entangled state. We model equal and unequal levels of photonic loss between the two propagating continuous variable modes, before detecting these states via a projective vacuum-one-photon measurement, and the other mode via balanced homodyne detection. We investigate homodyne measurement imperfections, and the associated success probability of the measurement schemes chosen in this protocol. We show that our entanglement swapping scheme is resilient to low levels of photonic losses, as well as low levels of averaged unequal losses between the two propagating modes, and show an improvement in this loss resilience over other hybrid entanglement schemes using coherent state superpositions as the propagating modes. Finally, we conclude that our protocol is suitable for potential quantum networking applications which require two nodes to share entanglement separated over a distance of 5 -- 10 km , when used with a suitable entanglement purification scheme.

show abstract

Improved measurement-device-independent quantum key distribution with uncharacterized qubits

Abstract: We propose an improved bound for the difference between phase and bit error rate in measurementdevice-independent quantum key distribution with uncharacterized qubits. We show by simulations that the bound considerably increases the final key rates.

Cited by 20 publications

References 12 publications

Improved Decoy-State Measurement-Device-Independent Quantum Key Distribution With Imperfect Source Encoding

Improved Decoy-State Measurement-Device-Independent Quantum Key Distribution With Imperfect Source Encoding

Conditions for the compatibility of channels in general probabilistic theory and their connection to steering and Bell nonlocality

Photonic hybrid state entanglement swapping using cat state superpositions

Contact Info

Product

Resources

About