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P. da Silva, M. Pelstring, M. Reagor, M. Rust, M. Scheer, M. Selvanayagam, M. Suska, M. Vahidpour, N. Alidoust, N. Didier, N. Rubin, N. Tezak, N. Vodrahalli, P. Karalekas, R. Chilcott, R. Manenti, R. Maydra, R. Renzas, R. Sinclair, R. Smith, S. Caldwell, S. Deshpande, S. Hong, T. El Bouayadi, T. Manning, T. Whyland, T.-W. To, V. Rawat, W. O'Brien, W. Zeng, Y. Mohan","submitted_at":"2017-06-20T17:33:29Z","abstract_excerpt":"We describe and implement a family of entangling gates activated by radio-frequency flux modulation applied to a tunable transmon that is statically coupled to a neighboring transmon. The effect of this modulation is the resonant exchange of photons directly between levels of the two-transmon system, obviating the need for mediating qubits or resonator modes and allowing for the full utilization of all qubits in a scalable architecture. The resonance condition is selective in both the frequency and amplitude of modulation and thus alleviates frequency crowding. 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