Rabi oscillations, Ramsey fringes and spin echoes in an electrical circuit

TL;DR

This paper demonstrates the control of quantum states in a superconducting circuit acting as an artificial atom, showcasing Rabi oscillations, Ramsey fringes, and spin echoes through microwave pulse manipulation.

Contribution

It introduces a superconducting tunnel junction circuit that functions as a controllable quantum spin system, enabling quantum state manipulations similar to atomic systems.

Findings

Successful demonstration of Rabi oscillations in the circuit

Observation of Ramsey fringes indicating coherent superpositions

Implementation of spin echo sequences to mitigate decoherence

Abstract

We present a superconducting tunnel junction circuit which behaves as a controllable atom, and whose ground and first excited state form an effective spin 1/2. By applying microwave pulses, we have performed on this circuit experiments demonstrating the controlled manipulation of the spin : Rabi precession, Ramsey interferences, and spin echoes.