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BEGIN:VEVENT
DTSTAMP:20201129T143243Z
LAST-MODIFIED:20201119T163842Z
DTSTART:20201130T140000Z
DTEND:20201130T150000Z
UID:event2381@bu.edu
URL:http://physics.bu.edu/events/show/2381
SUMMARY:Nonuniversal entanglement level statistics in projection-driven qua
ntum circuits
DESCRIPTION:Featuring Lei Zhang\, Boston University\, Physics Department\n\
nPart of the PhD Final Oral Exams.\n\nWe study the level-spacing statistics
in the entanglement spectrum of\noutput states of random universal quantum
circuits where qubits are\nsubject to a finite probability of projection t
o the computational\nbasis at each time step. We encounter two phase transi
tions with\nincreasing projection rate: The first is the volume-to-area law
\ntransition observed in quantum circuits with projective\nmeasurements; Th
e second separates the pure Poisson level statistics\nphase at large projec
tive measurement rates from a regime of residual\nlevel repulsion in the en
tanglement spectrum within the area-law\nphase\, characterized by non-unive
rsal level spacing statistics that\ninterpolates between the Wigner-Dyson a
nd Poisson distributions. By\napplying a tensor network contraction algorit
hm \nto the circuit spacetime\, we identify this second\nprojective-measure
ment-driven transition as a percolation transition\nof entangled bonds. The
same behavior is observed in both circuits of\nrandom two-qubit unitaries
and circuits of universal gate sets\,\nincluding the set implemented by Goo
gle in its Sycamore circuits.\n\n-----\n\nZOOM LINK\nhttps://bostonu.zoom.u
s/j/96327880887?pwd=ajFhL0xtc\nMeeting ID: 963 2788 0887\nPasscode: 623254
LOCATION: \, \,
STATUS:CONFIRMED
CLASS:PUBLIC
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