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Bulletin of the American Physical Society

Quantized Rabi oscillation observed in the superconducting flux qubit LC-harmonic oscillator system

Kouichi Semba, Jonas Johansson, Shiro Saito, Takayoshi Meno, Hideyuki Nakano, Masahito Ueda, Hideaki Takayanagi

Published Mar 17, 2006• 0 citations
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We have observed the coherent exchange of a single energy quantum between a flux qubit and a superconducting LC circuit acting as a quantum harmonic oscillator. The exchange of an energy quantum is known as the vacuum Rabi oscillation: the qubit is oscillating between the excited state and the ground state and the oscillator between the vacuum state and the first excited state. We also show that we can detect the state of the oscillator with the qubit and thereby obtained evidence of level quantization of the LC circuit. Our results support the idea of using oscillators as couplers of solid-state qubits.
In addition to Rabi, Ramsey, and spin echo experiments for a single qubit, we have successfully demonstrated the conditional operations with more complex pulse sequences of a qubit interacting with an LC harmonic oscillator. Rabi oscillations between |e,0〉 ↔ |g,1〉 (red sideband) and |g,0〉 ↔ |e,1〉 (blue sideband) were observed, where we noted coupled state as |qubit, LC‐oscillator〉. If we consider an LC‐oscillator as a quantum information bus, this is a first step to demonstrate the Cirac‐Zoller scheme in a field of macroscopic superconducting circuit.