Seminar Series: Engineering nonlinear Hamiltonians with Flux-Tunable Superconducting Circuits

Qiskit Seminar Series Episode 114 with Alessandro Miano
Engineering nonlinear Hamiltonians with Flux-Tunable Superconducting Circuits

Speaker: Alessandro Miano
Host: Zlatko Minev, PhD.

Abstract:

Flux-biased loops including one or more Josephson junctions are ubiquitous elements in quantum information experiments based on superconducting circuits. These quantum circuits can be tuned to implement a variety of Hamiltonians, with applications ranging from decoherence-protected qubits to quantum limited converters and amplifiers.
In this seminar, I will introduce a systematic method to analyze an arbitrary flux-biased superconducting circuit and compute the series expansion of its low-energy Hamiltonian. Remarkably, the expansion coefficients of such Hamiltonian can be expressed analytically as a function of the phase bias induced by the external flux on the smallest Josephson junction in the loop.
The Hamiltonian-engineering capabilities empowered by this description will be discussed, with a focus on designing superconducting circuits implementing tailor-made nonlinear parametric processes.

Bio:

Alessandro Miano is a postdoctoral associate at Yale University in the QuLab group. He is currently conducting experimental and theoretical research on novel superconducting circuits layouts, with a focus on flux-tunable Josephson devices for enhanced circuit QED applications.
Born and raised in Naples (Italy), he has received his bachelor’s and master’s degrees in Electrical Engineering from the University of Naples “Federico II”. During his Ph.D in Experimental Physics, he has developed, characterized and patented original Josephson circuits with enhanced functionalities. He earned his doctorate from University of Naples “Federico II” in 2021, after spending his last year of Ph.D as a visiting student at QuLab.
He is one of the recipients of the 2021 IEEE CSC Graduate Study Fellowship in Applied Superconductivity.