Spin–photon interfaces
Optical cavities can turn a spin state into a detectable photon response.
$$H_{\mathrm{int}}=\hbar g(a^\dagger\sigma_-+a\sigma_+)$$
Physical intuition
Optical cavities can turn a spin state into a detectable photon response.
Deep dive: physical mechanism
Cavity-enhanced emission or scattering links matter qubits to propagating optical modes, enabling remote readout and distributed sensing.
What is measured experimentally?
Measure spin-dependent reflection, transmission or fluorescence.
Assumptions, noise and limitations
Mode matching and optical loss reduce contrast.
Research and simulation exercise
Sweep cooperativity and estimate collection efficiency.
Connect the ideas
Explore the chapter overview, learning path, and references.