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VERSION:2.0
PRODID:Icfo
X-PUBLISHED-TTL:P1W
BEGIN:VEVENT
UID:6a47405283616
DTSTART:20260707T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20260707T110000Z
LOCATION:Seminar Room
SUMMARY:ICFO | BORA BARAN
CLASS:PUBLIC
DESCRIPTION:We show how the Heisenberg-limited quadratic Fisher-information
  regime of short-time quantum evolution can be made practically accessible
  for quantum Hamiltonian learning\, using only local quantum operations. O
 ur protocol uses experiments initialized in locally Haar-random product st
 ates\, accompanied by random one-shot Pauli-product measurements\, leading
  to the activation of the full Hamiltonian spectrum in the measurement sta
 tistics. This extends the naturally given quadratic Fisher scaling of shor
 t-time dynamics into a practically accessible temporal window without requ
 iring entanglement\, globally coherent measurements\, or dynamical control
 . Furthermore\, we show that the act of ensemble averaging over these init
 ial states makes unbiased estimation data\, meaning all Hamiltonian parame
 ters can be simultaneously estimated from the same data-set\, removing the
  need for parameter isolation. We supplement the theoretical results by sh
 owing empirically that\, even away from the asymptotic limit\, one can sur
 pass the SQL using randomly spread product-state ensembles. We do so numer
 ically by learning a selection of different disordered multi-qubit Hamilto
 nians in a black-box learning scenario.
DTSTAMP:20260703T045338Z
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