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Thursday, December 08, 2022
12:30 PM - 1:30 PM
Sig Hecker (03-0032-134)

Quantum Lunch

Entanglement Photonics: Creation and Application

Colin Lualdi
University of Illinois Urbana-Champaign

Quantum entanglement has many applications, ranging from networking to precision metrology. However, the large-scale deployment of entanglement-based technologies requires both the efficient preparation and the effective utilization of photonic entanglement resources. I will describe how our research group is pursuing single photons as a solution to the inefficiencies of current entanglement-generation methods. A plentiful supply of single photons has potential to enable the efficient assembly of entangled states. By combining multiplexing methods with high-purity single-photon sources, we have made great strides in realizing a high-efficiency single-photon source that will enable the large-scale operation of entanglement-generating quantum gates. Additionally, I will discuss our work in ultrasensitive metrology as an example of the effective use of entanglement. As metrological tools, conventional single-photon “classical” interference and quantum two-photon interference suffer from trade-offs between resolution and robustness against optical loss, noise, and dispersion. By instead employing pairs of highly non-degenerate frequency-entangled photons, we have combined the best of classical and quantum interference methods to demonstrate attosecond temporal resolution, enabling novel metrological applications with nanometer sensitivity.

Colin Lualdi is a physics PhD candidate in the group of Paul Kwiat at the University of Illinois Urbana-Champaign, where he studies quantum information science. His research interests include developing resources for photonic quantum technologies, including sources generating non-classical states of light and tools for the manipulation and measurement of these states. He is also interested in the application of these quantum resources towards achieving new capabilities such as entanglement-enhanced ultrasensitive metrology. Colin holds an AB in physics and certificates in computer science and linguistics from Princeton University.

Host: Malcolm Boshier