Infrared-Microwave Double Resonance

Jan P M de Vreede, H.A. Dijkerman

Sharmistha Ghoshal, Pradip Narayan Ghosh

F. Varsanyi

J. I. Steinfeld, Paul L. Houston

Shuhang You, M. H. Cai, S. S. Zhang +2 more

A microwave electric field sensing has been set up based on a three-color electromagnetically induced absorption in rubidium vapor cell via cascading transitions. All transitions are irradiated by infrared lasers: a 780 nm laser servers as probe to monitor the optical transmittancy via transition 5S1/2→P3/2;, a 776 nm laser and a 1260 nm laser are used to couple the states 5P3/2 and 5D5/2 and states 5D5/2 and 44F7/2, respectively. We find that a frequency detuning ∼2π × ( − 40) MHz of the 776 nm dressing beam prefers to a better signal-to-noise ratio for the probe beam. The off-resonance greatly depresses the double resonance pumping effect. A demonstration measurement for the electric field of microwave 1.18988 GHz, corresponding to the coupling resonance between two adjacent Rydberg states 44F7/2 and 44F9/2, gives a sensitivity of 55.79 ( 23 ) nVcm − 1 / Hz and a smallest discernible electric field of 78.9(33) nVcm−1 in time scale of 500 ms.

Karyn Le Hur

We emulate renormalization group models, such as the spin-boson Hamiltonian or the anisotropic Kondo model, from a quantum optics perspective by considering a superconducting device. The infrared confinement involves photon excitations of two tunable transmission lines entangled to an artificial spin-1/2 particle or double-island charge qubit. Focusing on the propagation of microwave light, in the underdamped regime of the spin-boson model, we identify a many-body resonance where a photon is absorbed at the renormalized qubit frequency and reemitted forward in an elastic manner. We also show that asymptotic freedom of microwave light is reached by increasing the input signal amplitude at low temperatures, which allows the disappearance of the transmission peak.