David P. DiVincenzo, Firat Solgun
We present a scheme for performing three-qubit parity measurements in a microwave circuit with superconducting resonators coupled to Josephson-junction qubits. The magnitude of the coupling is the same as achieved in current experiments, but each qubit should be coupled equally to two different microwave cavities. We write the quantum-eraser conditions that must be fulfilled for the parity measurements as requirements for the scatttering phase shift of our microwave structure. We show that these conditions are fulfilled for realistic values of device elements. A quantum calculation indicates that the measurement is optimal if the scattering signal can be measured with near single photon sensitivity. A comparison with an extension of a related proposal from cavity optics is presented. Extension of our scheme to four or more qubits, and to 3D cavity structures, is discussed.
View original:
http://arxiv.org/abs/1205.1910
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