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Physics Colloquium: Brian Zhou, University of Chicago
Shaping the quantum dynamics of single spins in diamond
Remarkable progress in the control of atomic-scale systems has confirmed the quantum foundation of our world, as well as inspired new opportunities for technological innovation. Due to its spin-photon interface, the nitrogen-vacancy (NV) center in diamond – a single electron spin at an atomic defect – presents a premier platform for quantum networks, while its long-lived quantum coherence and robust deployability across an extended phase diagram in temperature, field, and pressure make it uniquely suitable for high-precision sensing. In essence, these applications rely on the purposeful control of coherent quantum dynamics. In this talk, I will discuss new tools using resonant optical fields that manipulate single NV center spins with high efficiency and spatial resolution. We engineer ‘superadiabatic’ dynamics to overcome conventional speed limits to adiabatic protocols, thereby hybridizing their robustness with speed. Exploiting geometric aspects of quantum evolution, we demonstrate the robustness of adiabatic Berry phases to noise and the implementation of arbitrary quantum gates through high-speed, non-adiabatic holonomies. I will look ahead to the required groundwork and long-term directions for using NV centers as probes of diverse physical systems.
Thursday, February 15, 2018 at 4:00pm
Higgins Hall, 235
Higgins Hall, Chestnut Hill, MA 02467
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