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Entanglement genesis by ancilla-based parity measurement in 2D circuit QED (1311.5530v1)
Published 21 Nov 2013 in cond-mat.mes-hall and quant-ph
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 non-demolition. Separate interaction and measurement steps allow commencing subsequent data qubit operations in parallel with ancilla measurement, offering time savings over continuous schemes.