High temperature collective spin-photon coupling in a microwave cavity
arXiv:1306.6425 · doi:10.1134/S0030400X14060022
Abstract
An ensemble of N identical noninteracting spins being in thermal equilibrium and coupled to the resonant mode of a lossless microwave cavity is studied at arbitrary temperature T. Near T = 0 the system is known to be in a coupled spin-photon state that manifests itself by the splitting of the cavity mode (vacuum Rabi splitting). The cavity emission spectrum is simulated for arbitrary T. It is shown that the spin-photon coherence can be partially preserved for T < w sqrt{N}/2, where w is the spin excitation energy, even in case when the spins are randomly directed. The calculations corroborate recent room-temperature observations of the collective coupling between the microwave cavity mode and the electron spin ensemble (NV centers in diamond, DPPH, Fe8 nanomagnets). At higher T, as a consequence of thermal excitations within the spin ensemble, the two lines of the emission spectrum merge into a narrow line with broad wings.
References in corpus (10)
- Quantum Computing
- Strong Coupling of a Spin Ensemble to a Superconducting Resonator
- Quantum Teleportation Between Distant Matter Qubits
- Coherent coupling of a superconducting flux-qubit to an electron spin ensemble in diamond
- Quantum computing with an electron spin ensemble
- Magnetic strong coupling in a spin-photon system and transition to classical regime
- Strong magnetic coupling of an inhomogeneous NV ensemble to a cavity
- Collective coupling of a macroscopic number of single-molecule magnets with a microwave cavity mode
- Photon and spin dependence of the resonance lines shape in the strong coupling regime
- Dynamical decoherence in a cavity with a large number of two-level atoms