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Composable free-space continuous-variable quantum key distribution using discrete modulation
Kevin Jaksch, Thomas Dirmeier, Yannick Weiser +16
Continuous-variable (CV) quantum key distribution (QKD) allows for quantum secure communication with the benefit of being close to existing classical coherent communication. In rec…
Finite-Size Security for Discrete-Modulated Continuous-Variable Quantum Key Distribution Protocols
Florian Kanitschar, Ian George, Jie Lin +2
Discrete-Modulated (DM) Continuous-Variable Quantum Key Distribution (CV-QKD) protocols are promising candidates for commercial implementations of quantum communication networks du…
An Improved Correction Term for Dimension Reduction in Quantum Key Distribution
Twesh Upadhyaya, Thomas van Himbeeck, Norbert Lütkenhaus
The dimension reduction method enables security proofs of quantum key distribution (QKD) protocols that are originally formulated in infinite dimensions via reduction to a tractabl…
Finite-Key Analysis of Quantum Key Distribution with Characterized Devices Using Entropy Accumulation
Ian George, Jie Lin, Thomas van Himbeeck +2
The Entropy Accumulation Theorem (EAT) was introduced to significantly improve the finite-size rates for device-independent quantum information processing tasks such as device-inde…
Numerical Security Proof for Decoy-State BB84 and Measurement-Device-Independent QKD Resistant against Large Basis Misalignment
Wenyuan Wang, Norbert Lütkenhaus
In this work, we incorporate decoy-state analysis into a well-established numerical framework for key rate calculation, and apply the numerical framework to decoy-state BB84 and me…
Robust Interior Point Method for Quantum Key Distribution Rate Computation
Hao Hu, Jiyoung Im, Jie Lin +2
Security proof methods for quantum key distribution, QKD, that are based on the numerical key rate calculation problem, are powerful in principle. However, the practicality of the…
Improving key rates of the unbalanced phase-encoded BB84 protocol using the flag-state squashing model
Nicky Kai Hong Li, Norbert Lütkenhaus
All phase-encoded BB84 implementations have signal states with unbalanced amplitudes in practice. Thus, the original security analyses a priori do not apply to them. Previous secur…
Trusted detector noise analysis for discrete modulation schemes of continuous-variable quantum key distribution
Jie Lin, Norbert Lütkenhaus
Discrete-modulated continuous-variable quantum key distribution protocols are promising candidates for large-scale deployment due to the large technological overlap with deployed m…
Clifford group restricted eavesdroppers in quantum key distribution
L. C. G. Govia, D. Bunandar, J. Lin +3
Quantum key distribution (QKD) promises provably secure cryptography, even to attacks from an all-powerful adversary. However, with quantum computing development lagging behind QKD…
Asymptotic security analysis of discrete-modulated continuous-variable quantum key distribution
Jie Lin, Twesh Upadhyaya, Norbert Lütkenhaus
Continuous-variable quantum key distribution (CV QKD) protocols with discrete modulation are interesting due to their experimental simplicity and their great potential for massive…
Eavesdropper's ability to attack a free-space quantum-key-distribution receiver in atmospheric turbulence
Poompong Chaiwongkhot, Katanya B. Kuntz, Yanbao Zhang +6
The ability of an eavesdropper (Eve) to perform an intercept-resend attack on a free-space quantum key distribution (QKD) receiver by precisely controlling the incidence angle of a…
Characterization of Gram matrices of multimode coherent states
Ashutosh S Marwah, Norbert Lütkenhaus
Quantum communication protocols are typically formulated in terms of abstract qudit states and operations, leaving the question of an experimental realization open. Direct translat…
Simple security analysis of phase-matching measurement-device-independent quantum key distribution
Jie Lin, Norbert Lütkenhaus
Variations of phase-matching measurement-device-independent quantum key distribution (PM-MDI QKD) protocols have been investigated before, but it was recently discovered that this…
Security-proof framework for two-way Gaussian quantum-key-distribution protocols
Quntao Zhuang, Zheshen Zhang, Norbert Lütkenhaus +1
Two-way Gaussian protocols have the potential to increase quantum key distribution (QKD) protocols' secret-key rates by orders of magnitudes~[Phys.~Rev.~A {\bf 94}, 012322 (2016)].…
Families of Quantum Fingerprinting Protocols
Benjamin Lovitz, Norbert Lütkenhaus
We introduce several families of quantum fingerprinting protocols to evaluate the equality function on two -bit strings in the simultaneous message passing model. The original q…
Numerical evidence for bound secrecy from two-way post-processing in quantum key distribution
Sumeet Khatri, Norbert Lütkenhaus
Bound secret information is classical information that contains secrecy but from which secrecy cannot be extracted. The existence of bound secrecy has been conjectured but is curre…
Simulating single photons with realistic photon sources
Xiao Yuan, Zhen Zhang, Norbert Lutkenhaus +1
Quantum information processing provides remarkable advantages over its classical counterpart. Quantum optical systems are proved to be sufficient for realizing general quantum task…
Entanglement verification with detection-efficiency mismatch
Yanbao Zhang, Norbert Lutkenhaus
The security analysis of quantum key distribution is difficult to perform when there is efficiency mismatch between various threshold detectors involved in an experimental setup. E…
Role of syndrome information on a one-way quantum repeater using teleportation-based error correction
Ryo Namiki, Liang Jiang, Jungsang Kim +1
We investigate a quantum repeater scheme for quantum key distribution based on the work by Muralidharan et al., Phys. Rev. Lett. 112, 250501 (2014). Our scheme extends that work by…
Practical Quantum Retrieval Games
Juan Miguel Arrazola, Markos Karasamanis, Norbert Lütkenhaus
Complex cryptographic protocols are often constructed from simpler building-blocks. In order to advance quantum cryptography, it is important to study practical building-blocks tha…
Experimental quantum key distribution with simulated ground-to-satellite photon losses and processing limitations
Jean-Philippe Bourgoin, Nikolay Gigov, Brendon L. Higgins +5
Quantum key distribution (QKD) has the potential to improve communications security by offering cryptographic keys whose security relies on the fundamental properties of quantum ph…
Overcoming lossy channel bounds using a single quantum repeater node
David Luong, Liang Jiang, Jungsang Kim +1
We propose a scheme for performing quantum key distribution (QKD) which has the potential to beat schemes based on the direct transmission of photons between the communicating part…
Self-referenced continuous-variable quantum key distribution protocol
Daniel B. S. Soh, Constantin Brif, Patrick J. Coles +4
We introduce a new continuous-variable quantum key distribution (CV-QKD) protocol, self-referenced CV-QKD, that eliminates the need for transmission of a high-power local oscillato…
Security loophole in free-space quantum key distribution due to spatial-mode detector-efficiency mismatch
Shihan Sajeed, Poompong Chaiwongkhot, Jean-Philippe Bourgoin +3
In free-space quantum key distribution (QKD), the sensitivity of the receiver's detector channels may depend differently on the spatial mode of incoming photons. Consequently, an a…