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| QuEST: Quantum Erbium Sensor @ TTU |
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| Content: |
Quantum sensing focuses on utilizing quantum effects to gain non-classical metrological capabilities. Recently, solid-state qubits (quantum bits) are a promising alternative to superconducting or trapped-ion qubits because of easy integration and scalability. Rare-earth spin qubits have gained attention due to their narrow energy level transitions and long optical spin coherence lifetimes at visible and near-infrared. However, the lifetime of spin coherencies suffers from interactions between the rare-earth qubits and noisy environments. Here, we demonstrate a rare-earth spin qubit sensor embedded on an active resonant cavity on-chip. A single erbium ion is chosen as a spin qubit. By placing the device in the vicinity of a resonant cavity structure, Purcell enhancement occurs, increasing spin coherence lifetimes. Our cavity utilizes a thin film of VO2 deposited onto a gold back-mirror on a sapphire substrate. Vanadium Oxide is an active material whose index of refraction is controllable by a metal-insulator phase transition. We drop cast Er ions onto the VO2 surface and tune the cavity by adjusting its temperature. NMR information of the ensemble is obtained by placing the device in an optical cryostat, applying an external magnetic field, and observing fluorescence lifetime and spin relaxation rate using a pulsed laser and Ramsey interferometer. By observing that external factors can control the lifetime of coherencies and that the signal can be enhanced (or erased) by a reconfigurable cavity, we will demonstrate that our device can be used as a quantum sensor, whose output depends on the coherence of an ensemble of spin states. |
| Id: |
6 |
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| Duration: |
00' |
| Contribution type: |
Poster |
| Primary Authors: |
BROWN, Zach (What) |
| Presenters: |
BROWN, Zach |
| Material: |
 Poster |
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