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DTSTAMP:20261028T042347Z
LAST-MODIFIED:20170210T211514Z
DTSTART:20170216T203000Z
DTEND:20170216T213000Z
UID:event1726@bu.edu
URL:http://physics.bu.edu/internal/events/show/1726
SUMMARY:Building quantum materials with superconducting circuits
DESCRIPTION:Featuring Angela Kou\, Yale\n\nPart of the Biophysics/Condensed
	 Matter Seminar Series.\n\nSuperconducting artificial atoms are created by 
	connecting  Josephson junctions\, which are nonlinear\, non-dissipative  el
	ements\,  to simple electrical circuits.  Individual artificial atoms can b
	e coupled using this same toolbox of inductors\, capacitors\, and Josephson
	 junc- tions to build novel quantum materials. In this talk\, I will discus
	s prospects for using the fluxonium artificial atom as a building block for
	 topological materials. Topological phases of matter have excitations with 
	exotic quantum statistics and have been proposed as a plat- form for robust
	 quantum computation. Building a topological material from the bottom-up\, 
	however\, requires individual components with degenerate ground states and 
	strong coupling between these components.\nI will describe two circuits bas
	ed on the fluxonium artificial atom that meet these require- ments. The fir
	st circuit is an artificial molecule composed of two strongly-coupled fluxo
	nium artificial atoms\, which realizes a Hamiltonian with a dominant σz σ
	z -type interaction between the individual atoms [1]. We find excellent agr
	eement between the measured spectroscopy of the circuit and the theoretical
	ly-predicted level transitions\, which highlights the suitability of superc
	onducting circuits for implementing tailored quantum systems. Instead of th
	e cos ϕ energy term characteristic of a Josephson junction\, the second ci
	rcuit realizes an unconven- tional cos 2ϕ energy term\, which results in a
	 nearly-degenerate ground-excited state manifold. Taken together\, these ci
	rcuits fulfill the requirements for the building blocks of topological phas
	es and we can thus start to realize topological materials using superconduc
	ting circuits.\n\n[1] A. Kou\, et al.\, arxiv:1610.01094 (2016).
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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