Quantum control of an oscillator with a Kerr-cat qubit

Demonstrates driven conditional-displacement coupling between a Kerr-cat ancilla and a high-Q microwave cavity.

Key Results

Conditional displacement plus Kerr-cat one-qubit gates enables universal cavity control
Frequency-selective dissipation suppresses heating-induced cavity dephasing
Measured Kerr strength K/2pi = 0.93(3) MHz in the demonstrated device