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While the on-chip processing power in circuit QED devices is growing rapidly,an open challenge is to establish high-fidelity quantum links between qubits ondifferent chips. Here, we show entanglement between transmon qubits ondifferent cQED chips with $49\%$ concurrence and $73\%$ Bell-state fidelity. Weengineer a half-parity measurement by successively reflecting a coherentmicrowave field off two nearly-identical transmon-resonator systems. Byensuring the measured output field does not distinguish $\vert 01 \rangle$ from$\vert 10 \rangle$, unentangled superposition states are probabilisticallyprojected onto entangled states in the odd-parity subspace. We use in-situtunability and an additional weakly coupled driving field on the secondresonator to overcome imperfect matching due to fabrication variations. Todemonstrate the flexibility of this approach, we also produce an even-parityentangled state of similar quality, by engineering the matching of outputs forthe $\vert 00 \rangle$ and $\vert 11 \rangle$ states. The protocol ischaracterized over a range of measurement strengths using quantum statetomography showing good agreement with a comprehensive theoretical model.

Chip-to-chip entanglement of transmon qubits using engineered measurement fields