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Entanglement genesis by ancilla-based parity measurement in 2D circuit QED.

Research paper by O-P OP Saira, J P JP Groen, J J Cramer, M M Meretska, G G de Lange, L L DiCarlo

Indexed on: 04 Mar '14Published on: 04 Mar '14Published in: Physical review letters



Abstract

We present an indirect two-qubit parity meter in planar circuit quantum electrodynamics, realized by discrete interaction with an ancilla and a subsequent projective ancilla measurement with a dedicated, dispersively coupled resonator. Quantum process tomography and successful entanglement by measurement demonstrate that the meter is intrinsically quantum nondemolition. Separate interaction and measurement steps allow the execution of subsequent data-qubit operations in parallel with ancilla measurement, offering time savings over continuous schemes.