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Universal quantum operations and ancilla-based read-out for tweezer clocks
Ran Finkelstein1, Richard Bing-Shiun Tsai1, Xiangkai Sun1
1California Institute of Technology, Pasadena, CA, USA.
Nature
|October 9, 2024
Summary
Researchers demonstrate universal quantum operations for neutral-atom optical clocks, enabling enhanced precision in quantum metrology. This breakthrough paves the way for practical quantum sensors and hybrid quantum devices.
Area of Science:
- Quantum Information Science
- Atomic Physics
- Metrology
Background:
- Harnessing quantum entanglement is crucial for advancing quantum metrology and achieving higher measurement precision.
- Neutral-atom optical clocks are leading timekeeping systems but have lacked the necessary control for advanced entanglement schemes.
- Overcoming noise to reach theoretical sensitivity limits requires optimal probe-state generation and readout strategies.
Purpose of the Study:
- To demonstrate universal quantum operations and ancilla-based readout for neutral-atom optical clocks.
- To enable a circuit-based approach to quantum metrology using neutral-atom optical clocks.
- To lay the foundation for hybrid quantum devices integrating processors and sensors.
Main Methods:
- Implemented two-qubit entangling gates with high fidelity (99.62%) using Rydberg interactions and dynamical connectivity.
- Utilized local addressing for universally programmable quantum circuits in a tweezer clock platform.
- Employed ancilla-based quantum logic spectroscopy for fast, repeated phase detection with non-destructive qubit reset.
Main Results:
- Generated near-optimal entangled probe states, including Greenberger-Horne-Zeilinger states of various sizes.
- Performed dual-quadrature Greenberger-Horne-Zeilinger readout.
- Achieved minimal dead time between repeated measurements through conditional qubit reset.
Conclusions:
- The demonstrated universal quantum operations and readout strategies are foundational for advancing neutral-atom optical clocks in quantum metrology.
- This work enables practical applications of quantum processors linked with quantum sensors.
- It opens new avenues for hybrid processor-clock devices utilizing neutral atoms.
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