28 citations · 76 across the 12 of their papers we have counts for
13 papers
Randomness can be certified in energy-constrained semi-device-independent scenarios
Shashank Kumar Ranu, Lewis Wooltorton, Alastair A. Abbott +1
The prepare-and-measure framework based on energy constraints offers a practical middle ground between fully device-dependent and device-independent quantum cryptography. The only…
Chain rules for conditional entropies in quantum cryptography: limitations and improvements
Lewis Wooltorton, Peter Brown, Omar Fawzi
Security proofs in quantum cryptography rely on conditional entropies. In a many-round protocol, their estimation is a challenging task; one must account for the most general attac…
Quantum Nonlocality and Device-Independent Randomness are Robust to Noisy Signaling Channels
Kuntal Sengupta, Lewis Wooltorton
Given a pair of isolated devices that accept random binary inputs and return binary outputs, a user can deduce from the observed data alone if the underlying mechanism can be expla…
Numerical security framework for quantum key distribution with bypass channels
Lewis Wooltorton, Twesh Upadhyaya, Mohsen Razavi
Satellite based quantum key distribution (QKD) aims to establish secure key exchange over long distances despite significant technological challenges. To alleviate some of these ch…
An efficient construction of Raz's two-source randomness extractor with improved parameters
Cameron Foreman, Lewis Wooltorton, Kevin Milner +1
Randomness extractors are algorithms that distill weak random sources into near-perfect random numbers. Two-source extractors enable this distillation process by combining two inde…
Composable framework for device-independent state certification
Rutvij Bhavsar, Lewis Wooltorton, Joonwoo Bae
Certifying a quantum state in a device-independent (DI) manner, in which no trust is placed on the internal workings of any physical components, is a fundamental task bearing vario…
Genuine multipartite entanglement is not necessary for standard device-independent conference key agreement
Lewis Wooltorton, Peter Brown, Roger Colbeck
Conference key agreement aims to establish shared, private randomness among many separated parties in a network. Device-independent conference key agreement (DICKA) is a variant in…
Self-testing in the compiled setting via tilted-CHSH inequalities
Arthur Mehta, Connor Paddock, Lewis Wooltorton
This work investigates the family of extended tilted-CHSH inequalities in the single-prover cryptographic compiled setting. In particular, we show that a quantum polynomial-time pr…
Device-independent quantum key distribution with arbitrarily small nonlocality
Lewis Wooltorton, Peter Brown, Roger Colbeck
Device-independent quantum key distribution (DIQKD) allows two users to set up shared cryptographic key without the need to trust the quantum devices used. Doing so requires nonloc…
Expanding bipartite Bell inequalities for maximum multi-partite randomness
Lewis Wooltorton, Peter Brown, Roger Colbeck
Nonlocal tests on multi-partite quantum correlations form the basis of protocols that certify randomness in a device-independent (DI) way. Such correlations admit a rich structure,…
Satellite-Based Quantum Key Distribution in the Presence of Bypass Channels
Masoud Ghalaii, Sima Bahrani, Carlo Liorni +9
The security of prepare-and-measure satellite-based quantum key distribution (QKD), under restricted eavesdropping scenarios, is addressed. We particularly consider cases where the…
Tight analytic bound on the trade-off between device-independent randomness and nonlocality
Lewis Wooltorton, Peter Brown, Roger Colbeck
Two parties sharing entangled quantum systems can generate correlations that cannot be produced using only shared classical resources. These nonlocal correlations are a fundamental…
Twin-field quantum key distribution with fully discrete phase randomization
Guillermo Currás-Lorenzo, Lewis Wooltorton, Mohsen Razavi
Twin-field (TF) quantum key distribution (QKD) can overcome fundamental secret-key-rate bounds on point-to-point QKD links, allowing us to reach longer distances than ever before.…