We are pleased to have AssistantProfessor Yvonne Gao fromCentre for Quantum Technologies, National University of Singapore to present atalk titled: Programmablequantum interference between two superconducting cavities.
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Interferencebetween particles is one of the simplest and yet most elegant demonstrations ofquantum mechanics. It provides insights into fundamental scientific problemsand enables technological applications such as quantum computing andcryptography. Pioneering experiments often used optical photons, whichinterfere readily through simple beam splitters. However, studying more complexinterference phenomena requires the ability to create, manipulate, and measurearbitrary quantum states. While these tasks are challenging for photons flyingalong an optical fiber, high-quality experiments can be performed on trappedparticles. We show that it is possible to combine the best of both worlds in asingle system where we have the ability to prepare and control exotic quantumstates, as well as the capability to switch on a robust and tunable couplingbetween them.
Weengineered a time-dependent bilinear coupling that can be tuned to implement arobust beam splitter between two superconducting cavities and realize a highquality Hong-Ou-Mandal interferometer between them.
We alsoefficiently probe the quantum state overlap between two multiphoton states.Lastly, we combine our beam splitter with on-demand differential phase shiftersto create a programmable Mach-Zehnder interferometer that is capable ofmanipulating two-photon interference on the fly. Our results pave the waytowards scalable boson sampling, linear optical quantum computing in themicrowave domain, and quantum algorithms between long-lived bosonic memories.
About the Speaker
Yvonne is aPrincipal Investigator in the Centre for Quantum Technologies and aPresidential Young Professor in the Department of Physics, National Universityof Singapore. Her team works on building robust quantum hardware usingsuperconducting microwave circuits. Their devices provide useful new avenues todevelop novel techniques for quantum information processing as well as toexplore interesting effects in quantum physics. Yvonne received her B.A inPhysics from the University of Oxford and Ph.D from Yale University. She isalso a recipient of the Singapore National Research Foundation (NRF) Fellowship(Class 2020) and MIT Tech Review’s Innovator’s Under 35 (Asia-Pacific) award.