Upcoming Talks

With the rapid advances in optical quantum information processing, it is paramount to efficiently and accurately characterize quantum states offering exponential speedups and fault tolerance. Conventional quantum state characterization relies on balanced homodyne detection techniques, which suffer from limited electronic bandwidth and overall detection inefficiency. In this work, we propose an all-optical loss-tolerant measurement scheme with a high-gain phase-sensitive optical parametric amplifier for rigorously characterising the non-classical properties of quantum states. Our scheme can be readily realised with current quantum photonic technologies.

First-year PhD student in Physics

Our goal is to realize a quantum network. In particular, we focus on a promising approach using an all-photonic quantum network scheme using photon cluster states. In this presentation, I am going to present our original architectures to realize quantum communication between long distances covering over a few thousand km. In the beginning, I introduce quantum teleportation protocol and the necessity of pre-shared entanglement Bell pairs. We robustly protect our entanglement pairs from external noises with GKP error correction and [[7, 1, 3]] Steane error correction. This combination creates a synergistic effect that goes beyond a simple additive effect.  Then, I show the time evolution of the entanglement pairs consisting of (1) the elementary entanglement pairs construction process, (2) the outer swapping process, and (3) the inner swapping process, step by step. We also show the effectiveness of our scheme using simulation. Especially we find that our all-photonic scheme enables us to communicate over a thousand km with a large repeater spacing of 9 km, which is around 2-4 times larger than previously proposed all-photonic schemes. Finally, we conclude with our next research topic, all-photonic quantum switch, and with a high-level perspective on the large-scale multi-user all-photonic quantum network society. 

Ryosuke Shiina is a PhD candidate through the Department of Physics at the University of Massachusetts, Amherst. He has been researching under his advisor, Prof. Filip Rozpedek, and has been a graduate student researcher with the Center for Quantum Networks. He is a quantum network architect, and his main area of research is theory relating to quantum network schemes, error correction codes such as GKP-code and Cat code, and graph theory.

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Prateek Mantri is a CS PhD student working with Prof. Don Towsley. His research focuses on performance evaluation of quantum network architectures.

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Mingyuan Wang is a PhD student working with Prof. Stefan Krastanov. His research focuses on the entanglement distillation and quantum error correction.

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1st year Grad student in the ECE Department.