Harnessing time-frequency qudits using integrated nonlinear processes
Speaker: Dr Laura Serino
Affiliation: University of Queensland
Abstract
High-dimensional quantum systems, or qudits, offer significant advantages over qubits, from increased information capacity to enhanced noise resilience and security in quantum communication. While the time-frequency degree of freedom of photons offers large, fiber-compatible quantum states that are ideal for these systems, practical progress has been limited by the lack of an experimental framework that can flexibly generate, manipulate, and measure these states. In this talk, we present a scalable, reconfigurable platform for time-frequency qudit processing based on the multi-output quantum pulse gate (mQPG). This programmable decoder, implemented via dispersion-engineered sum-frequency generation in a nonlinear waveguide, enables real-time, parallel projective measurements onto arbitrary temporal-mode bases. We demonstrate high-dimensional quantum key distribution, precise quantum state characterization, and tests of quantum complementarity in large Hilbert spaces.
About Physics colloquium
The Physics Colloquium series hosts a range of speakers from Australia and abroad. The series explores a variety of topics and everyone is welcome to come along. The seminars are open so there is no need to register your attendance.
If you would like to sign up for colloquium announcement emails, you can join the mailing list by sending a blank email to:
- For UQ email addresses: physics-colloquium-others-join@lists.science.uq.edu.au
- For non-UQ email addresses: physics-announce-external-join@lists.science.uq.edu.au
(Note: if you receive physics-all emails, you should already receive these and don't need to sign up again).
Venue
Room: 305
