title: High-Fidelity Resonator-Induced Phase Gate with Single-Mode Squeezing.
abstract: We propose to increase the fidelity of two-qubit resonator-induced phase gates in circuit QED by the use of narrow-band single-mode squeezing. We show that there exists an optimal squeezing angle and strength that erases qubit "which-path" information leaking out of the cavity and thereby minimizes qubit dephasing during these gates. Our analytical results for the gate fidelity are in excellent agreement with numerical simulations of a cascaded master equation that takes into account the dynamics of the source of squeezed radiation. With realistic parameters, we find that it is possible to realize a controlled-phase gate with a gate time of 200 ns and average infidelity of 10^{-5}.
authors.affiliation: Départment de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1.
authors.forename: Shruti
authors.initials: S
authors.lastname: Puri
authors.affiliation: Départment de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1.|Canadian Institute for Advanced Research, Toronto, Canada.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Blais