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CANCELED: Physics Colloquium – Herbert Fotso

April 13 | 4:00 pm - 5:00 pm

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Title: Making Better Qubits out of Spectrally Noisy Solid State Quantum Emitters

Abstract: Many systems that are promising qubits for quantum information processing are
emitters in the solid state and thus are subject to spectral diffusion: the random drift as a
result of the fluctuations (strain, charge or spin) in the surrounding bath of the
emission/absorption spectrum away from a set target frequency. This uncontrolled dynamics
adversely affects the efficiency of many fundamental operations for scalable quantum
information processing platforms. For instance, the ability to entangle distant quantum nodes
through two-photon interference relies on the indistinguishability of emitted photons at each
node and is essential for quantum networks. While overcoming spectral diffusion from
materials engineering remains a daunting task, we show that it is possible to mitigate the
deleterious effects of the environment with appropriately timed external control fields. In
particular, photon indistinguishability assessed through two-photon interference in the context
of a Hong-Ou-Mandel (HOM)-type experiment for two distant quantum emitters can be greatly
enhanced by suitable pulse control protocols.

Host: Lex Kemper



April 13

4:00 pm - 5:00 pm
Event Categories:
Riddick Hall 301