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Design, fabrication and test of a four superconducting quantum-bit processor

Abstract : This thesis presents our effort to design, fabricate and test a simple 4-Josephson qubit processor with scalability potential. The qubits are frequency tunable and are coupled to a shared coupling bus able to implement iSwap two-qubit gates on any pair of qubits. Each qubit is fitted with its own readout made of a Josephson bifurcation amplifier (JBA). The operation principle of the processor, the choice of parameters, the microwave layout design, as well as the fabrication processes are described. A first experiment demonstrates the simultaneous high-fidelity readout of all the qubits by frequency multiplexing of the JBA signals. A second one tests the two-qubit iSwap gate of the processor, the fidelity of which happens to be limited by the intrinsic qubit decoherence.
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Submitted on : Monday, October 12, 2015 - 11:07:01 AM
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  • HAL Id : tel-01214394, version 1

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Vivien Schmitt. Design, fabrication and test of a four superconducting quantum-bit processor. Physics [physics]. Université Pierre et Marie Curie - Paris VI, 2015. English. ⟨NNT : 2015PA066184⟩. ⟨tel-01214394⟩

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