Validity of resonant two-qubit gates in the ultrastrong coupling regime of circuit QED

Details Validity of resonant two-qubit gates in the ultrastrong coupling regime of circuit QED Validity of resonant two-qubit gates in the ultrastrong coupling regime of circuit QED

2011-09-06

arxiv.org/abs/1109.1305v2

Phys. Scr. T 147 (2012) 014031

Physics

Quantum Physics

8 pages, 4 figures. Accepted for publication in Physica Scripta, special issue in relation with the 18th Central European Work

Scientific paper

We investigate theoretically the performance of two-qubit resonant gates in the crossover from the strong to the ultrastrong coupling (USC) regime of light-matter interaction in circuit QED. Two controlled-PHASE gate schemes---that works well within the rotating wave-approximation (RWA)---are analyzed while taking into account the effects of counter-rotating terms appearing in the Hamiltonian. Our numerical results show that the fidelity of the gate operation is above 96 % when the ratio between the coupling strength and the resonator frequency, g/\omega_r, is of about 10 %. Novel schemes are required in order to implement ultrafast quantum gates when increasing the ratio g/\omega_r.

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