Deterministic protocol for mapping a qubit to coherent state superpositions in a cavity

Zaki Leghtas (1) , Gerhard Kirchmair (2) , Brian Vlastakis (2) , Michel H. Devoret (2) , Robert J. Schoelkopf (2) , Mazyar Mirrahimi (1)

1 SISYPHE - SIgnals and SYstems in PHysiology & Engineering
2 Departments of Applied Physics [New Haven]

We introduce a new gate that transfers an arbitrary state of a qubit into a superposition of two quasi-orthogonal coherent states of a cavity mode, with opposite phases. This qcMAP gate is based on conditional qubit and cavity operations exploiting the energy level dispersive shifts, in the regime where they are much stronger than the cavity and qubit linewidths. The generation of multi-component superpositions of quasi-orthogonal coherent states, non-local entangled states of two resonators and multi-qubit GHZ states can be efficiently achieved by this gate.

Domaines: Physique Quantique [quant-ph]; Autre [cond-mat.other]

Zaki Leghtas, Gerhard Kirchmair, Brian Vlastakis, Michel H. Devoret, Robert J. Schoelkopf, et al.. Deterministic protocol for mapping a qubit to coherent state superpositions in a cavity. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2013, 87, pp.042315. ⟨hal-00845186⟩