Resonant and off-resonant microwave signal manipulation in coupled superconducting resonators

Abstract

We present an experimental demonstration as well as a theoretical model of an integrated circuit designed for the manipulation of a microwave field down to the single-photon level. The device is made of a superconducting resonator coupled to a transmission line via a second frequency-tunable resonator. The tunable resonator can be used as a tunable coupler between the fixed resonator and the transmission line. Moreover, the manipulation of the microwave field between the two resonators is possible. In particular, we demonstrate the swapping of the field from one resonator to the other by pulsing the frequency detuning between the two resonators. The behavior of the system, which determines how the device can be operated, is analyzed as a function of one key parameter of the system, the damping ratio of the coupled resonators. We show a good agreement between experiments and simulations, realized by solving a set of coupled differential equations. arXiv:1802.09034v2 [cond-mat.mes-hall]

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

“…In this article, we have studied the atom localization based on dynamic Stark effect in the absorptive response in a V-type atom driven by the spatially modulated microwave field. Similar low-frequency-induced control of coherence effects are reported to be of increasing demand in various schemes at molecular level 34 , superconducting quantum circuits 35 and off-resonantly coupled quantum dot-cavity systems 36 . In the present atom-field system, we have shown the coherent control of localization in both the 1D and 2D cases for different choices of parameters controlling the evolution of standing waves in the system.…”

Exceptional points in tunable superconducting resonators

“…This effective Hamiltonian is analogous with the actual quantummechanical Hamiltonian operating on the corresponding Hilbert space, and it can be derived from the Lindblad master equation (see Appendix D and Refs. [56,61]). The eigenvalues of H can be written as…”

“…In terms of coupled dissipative systems, the EP separates the system between the overdamped and underdamped regimes being the point of critical coupling. It follows from the dynamics of the coupled system that at this point, the energy is transferred between the two resonators optimally fast without back and forth oscillation [42,56]. In particular, the rate of heat transfer at zero detuning is given by…”

“…5). By adding voltage-tunable dissipation to a system of two resonators with tunable coupling, our approach provides a conceptually higher level of control compared to the commonly studied systems which only have tunable coupling between the resonators [42,[50][51][52][53][54][55][56][57]. Hence, our work demonstrates a platform to control the dissipation and, consequently, local heat transport between neighboring nodes in a quantum electrical circuit.…”

Programmable Interference between Two Microwave Quantum Memories

“…In particular, superconducting microwave cavities coupled to transmon or other non-linear ancillae in the circuit quantum electrodynamics (cQED) framework have the capability to deterministically create complex bosonic states [14,15] and perform robust measurements of photon statistics. So far, interference between harmonic oscillator modes has been demonstrated in cQED systems using elements with tunable frequencies [16][17][18][19]. However, such systems The effective circuit of the cQED system containing two high-Q harmonic oscillators (orange, blue) bridged by a transmon (green), as well as an additional transmon mode that only capacitively couples to Alice (pink).…”