"Quantum position verification (QPV) plays a crucial role in secure quantum communication and nonlocal quantum computation. It ensures that a party involved in a communication protocol is at its claimed location, which is essential for secure communication, distributed computing, and location-based services.
In 2012, we established a tight connection between the security of QPV schemes and...
In the presence of symmetries, observables are defined as quantities that remain invariant under transformations of reference frames or coordinates. Recently, the concept of quantum reference frame (QRF) transformations has emerged, where reference frames themselves are treated as quantum systems subject to superposition and entanglement. This generalization extends the classical notion of...
I show that a manifold’s geometry can be reconstructed from its vibrational spectrum—provided one also measures the rates at which resonant modes nonlinearly excite one another under strong driving. Applied to spacetime, this yields a generalized Noether theorem: the specific pattern of energy-momentum non-conservation in quantum field theory on curved backgrounds, encoded in the scattering...
I will emphasise what I consider as the checkpoints on the road to quantum gravity as a part of my research program and ideology, the four points, viz., the prescription of gravity-matter interaction, observer dependence, resolution of issues and paradoxes in quantum fields in curved spacetimes (QFT in CST), and probes of quantum effects in gravity. QFT in CST has been very successful in...
Non-signalling conditions are usually understood to encode minimal requirements that any (quantum) systems put into spatial arrangements must satisfy in order to be consistent with special relativity. Recent works have argued that in scenarios involving more that two parties, conditions compatible with relativistic causality do not have to satisfy all possible non-signalling conditions but...
