High-contrast qubit interactions using multimode cavity QED

Physical Review Letters
David C McKayD I Schuster

Abstract

We introduce a new multimode cavity QED architecture for superconducting circuits that can be used to implement photonic memories, more efficient Purcell filters, and quantum simulations of photonic materials. We show that qubit interactions mediated by multimode cavities can have exponentially improved contrast for two qubit gates without sacrificing gate speed. Using two qubits coupled via a three-mode cavity system we spectroscopically observe multimode strong couplings up to 102 MHz and demonstrate suppressed interactions off resonance of 10 kHz when the qubits are ≈600  MHz detuned from the cavity resonance. We study Landau-Zener transitions in our multimode systems and demonstrate quasiadiabatic loading of single photons into the multimode cavity in 25 ns. We introduce an adiabatic gate protocol to realize a controlled-Z gate between the qubits in 95 ns and create a Bell state with 94.7% fidelity. This corresponds to an on/off ratio (gate contrast) of 1000.

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Citations

Aug 9, 2016·Proceedings of the National Academy of Sciences of the United States of America·C-L HungH J Kimble
Jun 22, 2016·Scientific Reports·L García-ÁlvarezL Lamata
Mar 2, 2018·Scientific Reports·Borja PeropadreCarlos Sabín
Sep 15, 2017·Nature·Frederic T ChongMargaret Martonosi
Jun 16, 2018·Physical Review Letters·Bradley A MooresK W Lehnert
Sep 14, 2018·Nature Communications·Mohammad MirhosseiniOskar Painter

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