Leveraging biased noise ancilla in quantum error correction: Experimental investigations of coupling between a transmon and a Kerr-Cat qubit: Part 1/2

Quantum error correction (QEC) protocols typically introduce an ancilla qubit to measure parity operators of data qubits which store quantum information. Unfortunately, ancilla errors can significantly impede the fault-tolerance of the QEC process. Recent theoretical work [1] has shown that the biased noise property of the Kerr-Cat qubit helps to mitigate ancilla back-action errors and bolster fault tolerance of QEC protocols. We will present experimental investigations of the coupling of a transmon and a Kerr-Cat qubit with the aim to demonstrate the potential benefits of biased noise ancilla in QEC.

In the first part of this two-part talk, we will describe our experiment demonstrating coupling between a transmon and a Kerr-Cat qubit.

[1] S. Puri, et al., Phys. Rev. X, 9, 041009 (2019).