2010/04/30 by I. Chiorescu, N. Groll, S. Bertaina +2 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.supr-con #quant-ph
paper · pdf · doi:10.1103/physrevb.82.024413
published as Phys. Rev. B, vol 82, issue 2, 024413 (2010) · Received 8 April 2010; revised manuscript received 17 June 2010; published 14 July 2010
arxiv created 2010/07/14 · arxiv updated 2010/07/15
We study the energy level structure of the Tavis-Cumming model applied to an ensemble of independent magnetic spins s=1/2 coupled to a variable number of photons. Rabi splittings are calculated and their distribution is analyzed as a functin of photon number n\rm max and spin system size N. A sharp transition in the distribution of the Rabi frequency is found at n\rm max≈ N. The width of the Rabi frequency spectrum diverges as √(N) at this point. For increased number of photons n\rm max>N, the Rabi frequencies converge to a value proportional to √n\rm max. This behavior is interpreted as analogous to the classical spin resonance mechanism where the photon is treated as a classical field and one resonance peak is expected. We also present experimental data demonstrating cooperative, magnetic strong coupling between a spin system and photons, measured at room temperature. This points towards quantum computing implementation with magnetic spins, using cavity quantum-electrodynamics techniques.