Suppression of photon shot noise dephasing in a tunable coupling superconducting qubit

Abstract

Quantum Information: quantum interference suppresses dephasing of qubits Scientists have realized a novel quantum device to improve the robustness of quantum information encoded in a qubit against noise. It is a well known difficulty in quantum information processing that the noise in the environment disturbs the quantum state of a qubit and degrades the qubit's performance. Andrew Houck and colleagues at Princeton University have designed and implemented a superconducting qubit that utilizes the quantum interference effect to decouple itself from microwaves in a nearby cavity. The researchers demonstrate the robust preparation, manipulation and measurement of the qubit in the presence of noise. This approach provides a promising element for the storage and processing of quantum information, mitigating effects of cross-talk when trying to control or measure multiple qubits.