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Absolute Quantum Yield Measurement of Powder Samples

Absolute Quantum Yield Measurement of Powder Samples

Published on: May 12, 2012

High-Density Quantum Sensing with Dissipative First Order Transitions.

Meghana Raghunandan¹, Jörg Wrachtrup², Hendrik Weimer¹

¹Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany.

Physical Review Letters

|May 15, 2018

Summary

This summary is machine-generated.

Interactions in quantum sensors can enhance sensitivity by triggering a phase transition. This new approach in quantum sensing offers robustness against imperfections, overcoming limitations of current technologies.

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Area of Science:

Quantum Technology
Condensed Matter Physics
Quantum Sensing

Background:

Quantum sensors typically rely on independent particles, with sensitivity scaling as sqrt[N].
Particle interactions at high densities challenge the independence assumption, limiting nanoscale quantum sensor performance.
Interactions are often viewed as a detrimental factor in quantum sensing.

Purpose of the Study:

To investigate if interactions in quantum sensors can be leveraged as an advantage.
To explore the potential of dissipative phase transitions in open quantum systems for enhanced quantum sensing.
To analyze the properties and experimental feasibility of such dissipative quantum sensors.

Main Methods:

Analysis of dissipative quantum sensors utilizing nitrogen-vacancy defect centers in diamond.
Application of a variational method to study the quantum many-body system.
Numerical simulation of the master equation for the open quantum system.

Main Results:

Demonstrated the existence of a dissipative first-order phase transition exploitable for quantum sensing.
Investigated the phase transition in 2D and 3D setups, confirming experimental observability with current technology.
Showcased the robustness of these sensors against disorder and decoherence, with sensitivity independent of T_{2} coherence time.

Conclusions:

Quantum sensing can benefit from controlled interactions via dissipative phase transitions.
Nitrogen-vacancy centers in diamond provide a viable platform for realizing these advanced quantum sensors.
This approach offers a pathway to overcome interaction-induced limitations in quantum metrology and sensing.