BBQ Lab

We are happy to announce our most recent arXiv submission: Equilibration of objective observables in a dynamical model of quantum measurements (https://arxiv.org/abs/2403.18016). There are many unanswered questions when it comes to quantum measurements. One such question: how can something seemingly irreversible, like a measurement, arise from unitary (and therefore reversible) dynamics? We find that the answer lies in quantum thermodynamics and the idea of equilibration-on-average!

In this paper, we work within the framework of the Measurement Equilibration Hypothesis (MEH) to construct a set of objectifying observables, best at objectively encoding the measurement statistics of a system. Our work has foundational implications for the emergence of classicality, as well as providing a step towards a fully physical model of quantum measurements. This work was carried out in collaboration with Dr. Max Lock and Dr. Tom Rivlin from the Quantum Information and Thermodynamics group (QuIT Physics) at TU Wien.

We’re very excited to share that our recent work was published in Physical Review Letters while also being highlighted on the cover of the journal!

In this collaboration with groups from University of Leeds and Imperial College London, we program high fidelity non-unitary qutrit operators inside a multi-mode fiber, simulating fusion and braiding of non-Abelian D(S₃) anyons. For this to work, we combine techniques developed in our previous works such as characterizing multi-mode fibers, designing non-unitary operations, as well as programming optical circuits.

You can read the open-access publication here:
Unveiling the Non-Abelian Statistics of D(S₃) Anyons Using a Classical Photonic Simulator, Phys. Rev. Lett. 132, 110601 (2024)