[22a-H101-1~9] Cavity & circuit-QED: frontier research at the leading edge

[22a-H101-3] Coherent coupling between a microwave cavity and ensemble of superconducting qubits

〇Yuichiro Matsuzaki¹, Kosuke Kakuyanagi¹, Corentin Deprez¹, Neil Lambert², Ishida Natsuko², Toida Hiraku¹, Semba Kouichi³, William Munro¹, Yamaguchi Hiroshi¹, Saito Shiro¹ (1.NTT BRL, 2.Riken, 3.NICT)

Keywords:superconducting qubits

We observe a coherent coupling between a microwave resonator and thousands of superconducting flux qubits. The ensemble of flux qubits are embedded into a microwave resonator, and we observe a dispersive shift of 250 MHz in the spectrum.Such a large frequency shift represents a collective behavior of thousands of two-level systems, which is the largest number of coupled superconducting qubits realized so far. Our system provides a new approach to realize quantum information processing.