Full Professor; Tier 1 Canada Research Chair in Quantum Communications and Cryptography
Canada
Broadbent develops quantum-information and cryptographic protocols, including a method for delegating a quantum computation while keeping the client's data and computation private under the protocol's model.
Universal blind quantum computation addresses a practical trust problem: a client may need a remote quantum server without revealing the calculation. Broadbent's joint work with Joseph Fitzsimons and Elham Kashefi gave a universal protocol using limited client-side quantum preparation, interactive classical instructions and optional authentication. This record credits that precise coauthored result rather than treating privacy as automatic for every cloud implementation.
Cross-appointed member of the Department of Physics; Quantum Optics group
Canada
Lo develops quantum-key-distribution protocols, including decoy-state and measurement-device-independent approaches that address concrete weaknesses in practical optical systems.
Quantum cryptography must connect a security proof to imperfect sources and detectors. Lo's coauthored decoy-state work uses vacuum or weak pulses to test the behavior of a communication channel, while measurement-device-independent QKD is designed to remove detector side channels from the security boundary. These are distinct protocol contributions with explicit models, not a claim that any optical link is secure by default.
Steane helped establish quantum error correction by connecting classical coding ideas with methods for protecting quantum information, and he initiated Oxford's ion-trap quantum-computing experiments.
Error correction is one of the conditions for extending a quantum computation beyond the lifetime of its unprotected components. Steane's 1996 paper presented code-based methods for correcting quantum errors and analyzed their limits and resource scaling. Oxford's current profile also identifies his role in co-discovering quantum error correction and initiating the university's ion-trap experiments. The record separates that individual contribution from the later work of the wider Oxford team.
Vedral develops quantum-information theory, including mathematical measures that quantify entanglement and clarify what purification procedures can extract from mixed quantum states.
Entanglement is useful only when researchers can say how much of it a state contains and what transformations can recover from noisy resources. Vedral's joint work with Martin Plenio developed a class of entanglement measures based on distance-like quantities, including relative entropy and the Bures metric, and related those measures to purification limits. This record focuses on that defined theoretical contribution rather than treating entanglement as a single directly observed hardware score.
