Undergraduate Honors Theses

Thesis Defended

Spring 2019

Document Type

Thesis

Type of Thesis

Departmental Honors

Department

Physics

First Advisor

Konrad Lehnert

Abstract

Circulators are crucial components in quantum computers that ensure that quantum information is coherently transported. Current commercial circula- tors are too bulky because they use permanent magnets, so producing chip- scale circulators is necessary to feasibly scale up the size of quantum computers using superconducting qubits. Using a model inspired by a paper by Rudner [2], I have designed a lattice circuit that will produce non-reciprocity, which is the property required for proper circulation. These lattice circuits are able to produce circulation because they have periodically time-dependent bonds that control interactions between the sites in the lattice. In this thesis, I first theoretically analyze two similar lattice circuits and show that they can both produce non-reciprocity. Finally, I experimentally demonstrate non-reciprocity in a 2 by 2 lattice circuit at room temperature. This experimental verification of circu- lation motivates future testing of larger lattices and building superconducting versions of the circuit to create chip-scale circulators.

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