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DTSTAMP:20260914T192654Z
LAST-MODIFIED:20160608T140304Z
DTSTART:20160615T150000Z
DTEND:20160615T160000Z
UID:event1619@bu.edu
URL:http://physics.bu.edu/internal/events/show/1619
SUMMARY:Chiral groundstate currents of interacting photons in a synthetic m
	agnetic field
DESCRIPTION:Featuring Pedram Roushan\, Google Inc.\, Santa Barbara\n\nPart 
	of the Condensed Matter Theory Seminar Series.\n\nThe intriguing many-body 
	phases of quantum matter arise from the interplay of particle interactions\
	, spatial symmetries\, and external fields. Generating these phases in an e
	ngineered system could provide deeper insight into their nature and the pot
	ential for harnessing their unique properties. However\, concurrently bring
	ing together the main ingredients for realizing many-body phenomena in a si
	ngle experimental platform is a major challenge. Using superconducting qubi
	ts\, we simultaneously realize synthetic magnetic fields and strong particl
	e interactions\, which are among the essential elements for studying quantu
	m magnetism and fractional quantum Hall (FQH) phenomena. The artificial mag
	netic fields are synthesized by sinusoidally modulating the qubit couplings
	. In a closed loop formed by the three qubits\, we observe the directional 
	circulation of photons\, a signature of broken time-reversal symmetry. We d
	emonstrate strong interactions via the creation of photon-vacancies\, or "h
	oles"\, which circulate in the opposite direction. The combination of these
	 key elements results in chiral groundstate currents\, the first direct mea
	surement of persistent currents in low-lying eigenstates of strongly intera
	cting bosons. The observation of chiral currents at such a small scale is i
	nteresting and suggests that the rich many-body physics could survive to sm
	aller scales. We also motivate the feasibility of creating FQH states with 
	near future superconducting technologies. Our work introduces an experiment
	al platform for engineering quantum phases of strongly interacting photons 
	and highlight a path toward realization of bosonic FQH states.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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