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Title: Validity of resonant two-qubit gates in the ultrastrong coupling regime of circuit quantum electrodynamics
Authors: Wang, Y.M.
Ballester, D.
Romero, G.
Scarani, V. 
Solano, E.
Issue Date: Feb-2012
Source: Wang, Y.M., Ballester, D., Romero, G., Scarani, V., Solano, E. (2012-02). Validity of resonant two-qubit gates in the ultrastrong coupling regime of circuit quantum electrodynamics. Physica Scripta (T147) : -. ScholarBank@NUS Repository.
Abstract: We investigate theoretically the performance of resonant two-qubit gates in the crossover from the strong to the ultrastrong coupling regime of lightmatter interaction in circuit quantum electrodynamics. Two controlled-phase (CPHASE) gate schemeswhich work well within the rotating wave-approximationare analysed 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/ r, is about 10%. Novel schemes are required in order to implement ultrafast quantum gates when increasing the ratio g/ r. © 2012 The Royal Swedish Academy of Sciences.
Source Title: Physica Scripta
ISSN: 00318949
DOI: T147/014031
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