Characterizing a superconducting charge qubit via environmental noise

Jason F. Ralph; Elias J Griffith; Terence D. Clark; Mark J. Everitt; Peter Stiffell

doi:10.1117/12.541492

24 August 2004 Characterizing a superconducting charge qubit via environmental noise

Jason F. Ralph, Elias J Griffith, Terence D. Clark, Mark J. Everitt, Peter Stiffell

Proceedings Volume 5436, Quantum Information and Computation II; (2004) https://doi.org/10.1117/12.541492
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

In this paper, we propose a technique to characterise the energy level structure of a superconducting charge qubit. The technique relies on the backreaction of a solid-state qubit on its environment and the incoherent transfer of energy from a high frequency mode to a low frequency mode due to the stochastic transitions of the qubit between energy eigenstates. We consider a coupled system consisting of a model charge qubit and several classical degrees of freedom. The qubit is coupled to three electromagnetic modes: a low frequency bias field, a higher frequency mode (which is used to pump the qubit from the ground state to an excited state), and a lossy reservoir (which represents the cavity that contains the qubit and control fields). The reservoir provides a mechanism to allow the qubit to dissipate energy and to induce spontaneous decays from an excited state into the ground state. We show that these spontaneous decays can have a significant effect on the noise in the classical bias field, and that this noise can be used to characterise the energy level structure of the qubit.

Citation Download Citation

Jason F. Ralph, Elias J Griffith, Terence D. Clark, Mark J. Everitt, and Peter Stiffell "Characterizing a superconducting charge qubit via environmental noise", Proc. SPIE 5436, Quantum Information and Computation II, (24 August 2004); https://doi.org/10.1117/12.541492

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