A protected gate for the zero-pi qubit via its internal modes | Xanda Koleshnikow (University of Sydney)

Spearker: Xanda Kolesnikow  (University of Sydney | AUS)

Host: Johannes Fink

The zero-pi qubit leverages multiple modes to achieve exponential suppression in both relaxation and dephasing. However, in order to perform Rabi gates, its protection must be broken. Alternatively, the zero-pi qubit can be coupled to a high-impedance resonator to perform protected single and two-qubit gates, as proposed by Brooks, Kitaev and Preskill [Phys. Rev. A  87, 052306 (2013)]. Here we propose to utilise the internal modes of the zero-pi qubit in place of the ancillary resonator to perform a protected gate. In this talk I will introduce the zero-pi qubit and compare the use of two of its internal modes to perform a protected gate. I will present simulations of this gate at parameter regimes corresponding to these internal modes, and discuss the experimental feasibility of this approach.