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Bulletin of the American Physical Society

Using a Superconducting Resonator with Frequency-Compensated Tunable Coupling to Transfer a Quantum State Deterministically and Directly

J. Wenner, Charles Neill, Chris Quintana, B. Campbell, Z. Chen, B. Chiaro, A. Dunsworth, P. J. J. O’Malley, A. Vainsencher, T. White, R. Barends, Y. Chen, Austin G. Fowler, Evan R. Jeffrey, Jack B. Kelly, Erik A. Lucero, A. Megrant, J. Mutus, M. Neeley, P. Roushan, D. Sank, John M. Martinis

Published Mar 15, 2016• 0 citations
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We analyze the transfer of a quantum state between two resonators connected by a superconducting transmission line. Nearly perfect state-transfer efficiency can be achieved by using adjustable couplers and destructive interference to cancel the back-reflection into the transmission line at the receiving coupler. We show that the transfer protocol is robust to parameter variations affecting the transmission amplitudes of the couplers. We also show that the effects of the Gaussian filtering, pulse-shape noise, and multiple reflections on the transfer efficiency are insignificant. However, the transfer protocol is very sensitive to frequency mismatch between the two resonators. Moreover, the tunable coupler we considered produces time-varying frequency detuning caused by the changing coupling. This detuning requires an active frequency compensation with an accuracy better than 9090%90 to yield the transfer efficiency above 9999%99.