Sampling and Scrambling on a Chain of Superconducting Qubits
Michael R. Geller · Physical Review Applied · 2018
A common task in quantum information science is to embed classical data into entangled multiqubit states. The author offers a practical embedding circuit for a chain geometry that is especially well suited for first-generation superconducting architectures. Measuring a variety of fidelity and information-theoretic quantities provides a detailed, quantitative assessment of actual performance using the IBM Quantum Experience ibmqx5 device. To check the expressiveness of this general-purpose circuit, the author also measures its ability to generate Haar random unitaries and quantum chaos, as reckoned by Porter-Thomas statistics and out-of-time-order correlation functions.