Nature Physics : Qudit Gates in an Optical Fiber

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Light traveling through an optical fibre

We’re very excited to share our latest work that was recently published in Nature Physics! Here we program optical circuits in a disordered medium by employing the disorder itself. We use these optical circuits to manipulate, and efficiently measure, high-dimensional entangled qudits.

A complex medium consists of millions of unitary operations within itself. Our method very carefully directs light through any combination of these operations, effectively programming a new arbitrary operation. This allows us to perform any set of quantum gates on high-dimensional states of light, including the ones necessary for entanglement certification and efficient quantum measurement.

This paper is very dense in terms of the variety of techniques involved in the theoretical formulation, experiment, simulations, data analysis, and computation, and most importantly, error analysis. This work was done along our collaborators Armin Tavakoli, Claudio Conti, and Pepijn Pinkse.

You can read the open access paper by following this link 10.1038/s41567-023-02319-6 . The codes and dataset used for the simulations in the paper are available on Github.

Welcome Kesini!

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A warm welcome to Kesini Chumphuthong, our newest visitor!

Hailing from the beautiful city of Songkhla in Thailand, Kesini is here for her internship in quantum optics while pursuing her undergraduate studies at Prince of Songkhla University. With a keen interest in quantum optics and multi-plane light converters, Kesini also enjoys recreating delicious Thai recipes and exploring new places in her free time.

Welcome aboard, Kesini! We’re thrilled to have you at BBQ Lab.

Welcome Mariana!

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We are delighted to welcome the newest addition to the BBQ Lab team: Mariana Annameng Ma!

Originally from China, Mariana obtained her undergraduate and master’s degrees in Physics at the Universidad de Buenos Aires. For her dissertation, she worked on the generation of correlated two-photon and four-photon states, characterising them through interferometric techniques. Now that she is joining us as a PhD student, we are excited to welcome her in the BBQ Lab to continue having fun with photonic entanglement.

Natalia wins top Uni Prize!

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We are thrilled to announce that our stellar postdoc, Dr. Natalia Herrera Valencia, has won Heriot-Watt University’s top research prize for her groundbreaking PhD dissertation on high-dimensional entanglement. This recognition is another jewel in her crown, a testament to Natalia’s contributions to the field of quantum information and communication.

Her remarkable journey is marked by an impressive collection of 10 published papers, including three highly cited first-author publications. These contributions have garnered over 500 citations to date, showcasing her exceptional impact at this early stage in her career.

Natalia’s thesis includes the demonstration of the unprecedented transport of quantum entanglement through a complex medium—a result that was featured on the cover of Nature Physics. It also caught the eye of the global media, including outlets such as BBC News. Congrats Natalia!