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Quantum Speed Limit in Quantum Sensing.

K Herb¹, C L Degen^1,2

¹Department of Physics, <a href="https://ror.org/05a28rw58">ETH Zürich</a>, 8093 Zürich, Switzerland.

Physical Review Letters

|December 6, 2024

Summary

This summary is machine-generated.

Researchers established the limits for time-resolved quantum sensing using qubit probes. A composite control sequence was shown to reach the quantum speed limit (QSL) for optimal temporal resolution.

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Area of Science:

Quantum Information Science
Quantum Metrology
Quantum Sensing

Background:

Quantum sensors utilize sophisticated control sequences to enhance sensitivity and precision.
Current quantum sensing protocols often neglect optimization for temporal resolution.

Purpose of the Study:

To establish fundamental limits for time-resolved sensing of dynamical signals using qubit probes.
To identify optimal control strategies for achieving high temporal resolution in quantum sensing.

Main Methods:

Theoretical analysis of qubit probe dynamics under various control sequences.
Investigation of the relationship between time resolution and the quantum speed limit (QSL).
Design and analysis of a composite control sequence using phase-shifted pulses.

Main Results:

The ultimate time resolution in quantum sensing is fundamentally linked to the quantum speed limit (QSL).
A specific composite control sequence, employing two phase-shifted pulses, achieves the theoretical QSL.
The findings provide a theoretical framework for optimizing temporal resolution in quantum sensors.

Conclusions:

The quantum speed limit (QSL) dictates the best achievable time resolution for dynamical signal sensing with qubit probes.
Composite control sequences offer a pathway to approach or reach the QSL for enhanced temporal resolution.
Practical implementation is feasible, demonstrated by the example of a nitrogen-vacancy center in diamond.