Quantum Sensing

1. Platforms

a) Solid-state spin ensembles

• (NMR ensembles, NV center ensembles ...)

b) Single solid-state spins

• Defects in crystalline materials (diamond, silica, silicon carbide ...) 
• Single organic molecules, single quantum dots

c) Superconducting circuits:

•  SQUIDs, superconducting qubits

d) Quantum optomechanics

• optomechanics, electromechanics and hybrid circuits

2. Quantum sensing 

a) Protocols

• Quantum sensor Hamiltonian, Examples of Ramsey and Rabi sequences 

b) Sensitivity

• Quantum noise, decoherence, single shot readout, averaged readout
• Slope and variance detection, Allan variance 

c) Sensing ac Signals

• Multipulse sequences, dynamical decoupling 

d) Noise Spectroscopy

• Decoherence, dynamical decoupling and filter functions, relaxometry (T1, T2, T2*)

3. Applications:
a) Biomedical applications (brain imaging, single-cell spectroscopy), quantum optimal control and machine learning