Readout for Phase Qubits without Josephson Junctions

Details Readout for Phase Qubits without Josephson Junctions Readout for Phase Qubits without Josephson Junctions

2010-01-09

arxiv.org/abs/1001.1453v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We present a novel readout scheme for phase qubits which eliminates the read-out SQUID so that the entire qubit and measurement circuitry only requires a single Josephson junction. Our scheme capacitively couples the phase qubit directly to a transmission line and detects its state after the measurement pulse by determining a frequency shift observable in the forward scattering parameter of the readout microwaves. This readout is extendable to multiple phase qubits coupled to a common readout line and can in principle be used for other flux biased qubits having two quasi-stable readout configurations.

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