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Physics Colloquia 293 (2/8/19)

February 8, 2019 - 2:30pm

Byoung Seung Ham, Gwangju Institute of Science and Technology

Abstract:

Over decades quantum information has been progressed and produced preliminary versions of noisy quantum computing, cryptography, and sensing devices. Due to the inevitable interactions with environments, any qubit should suffer from dephasing effects, resulting in noise limiting its functional capabilities. Although several versions of hundred-qubit-quantum computing hardware have been invented by companies and academia, the quantum supremacy may not be reached unless the noise problem is completely solved. Here, in this talk, I present the quantum coherence control to manipulate ensemble qubits and subsidize the noise via coherence conversion between optical and spin transitions. This technique is quite effective especially to solid states whose spin transitions are inhomogeneouslybroadened. As a result, the coherence conversion leads to wavelength convertible quantum memories whose storage time is ultralong in the unit of minutes or even hours.

Flyer File: ham_byoung_physics_flyer.pdf