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BEGIN:VEVENT
DTSTAMP:20261017T181343Z
LAST-MODIFIED:20200319T130853Z
DTSTART:20200320T140000Z
DTEND:20200320T150000Z
UID:event2316@bu.edu
URL:http://physics.bu.edu/internal/events/show/2316
SUMMARY:Nonuniversal entanglement level statistics in projection-driven qua
	ntum circuits
DESCRIPTION:Featuring Lei Zhang\, Boston University\, Physics Department\n\
	nPart of the Departmental Seminars.\n\nWe study the level-spacing statistic
	s in the entanglement spectrum of\noutput states of random universal quantu
	m circuits where qubits are\nsubject to a finite probability of projection 
	to the computational\nbasis at each time step. We encounter two phase trans
	itions with\nincreasing projection rate: The first is the volume-to-area la
	w\ntransition observed in quantum circuits with projective\nmeasurements; T
	he second separates the pure Poisson level statistics\nphase at large proje
	ctive measurement rates from a regime of residual\nlevel repulsion in the e
	ntanglement spectrum within the area-law\nphase\, characterized by non-univ
	ersal level spacing statistics that\ninterpolates between the Wigner-Dyson 
	and Poisson distributions. By\napplying a tensor network contraction algori
	thm \nto the circuit spacetime\, we identify this second\nprojective-measur
	ement-driven transition as a percolation transition\nof entangled bonds. Th
	e same behavior is observed in both circuits of\nrandom two-qubit unitaries
	 and circuits of universal gate sets\,\nincluding the set implemented by Go
	ogle in its Sycamore circuits.\n\nDissertation Committee: A. E. Ruckenstein
	\, C. Chamon\, M. El-Batanouny\, R. Brower (ECE)\n\nLink of Zoom Seminar Ev
	ent: https://bostonu.zoom.us/j/957452767
LOCATION: Virtual\, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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