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.
@article{arxiv.1311.5530,
title = {Entanglement genesis by ancilla-based parity measurement in 2D circuit QED},
author = {O. -P. Saira and J. P. Groen and J. Cramer and M. Meretska and G. de Lange and L. DiCarlo},
journal= {arXiv preprint arXiv:1311.5530},
year = {2014}
}
Comments
5 pages, 4 figures; supplemental material with 5 figures