International Business Machines Corporation
Electrical circuits for leakage reduction units

Abstract:

A system resets leakage states of a superconducting qubit to a qubit subspace by using a dedicated electrical circuit on a timescale faster than a natural decay process. One system comprises a qubit including a qubit transition frequency and multiple qubit leakage transition frequencies; and a filter circuit coupled to the qubit for leakage mitigation based on the qubit frequency and the multiple qubit leakage transition frequencies, wherein the filter circuit causes dissipation at the leakage transition frequencies while isolating the qubit transition frequency. Another system comprises a qubit including a qubit transition frequency and multiple qubit leakage transition frequencies; and a tunable dissipative cavity circuit coupled to the qubit for leakage mitigation based on the qubit frequency and the multiple qubit leakage transition frequencies, wherein the tunable dissipative cavity circuit causes the leakage transition frequencies to dissipate while isolating the qubit transition frequency.