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BEGIN:VEVENT
DTSTAMP:20260802T064450Z
LAST-MODIFIED:20190411T172615Z
DTSTART:20190412T160000Z
DTEND:20190412T170000Z
UID:event2091@bu.edu
URL:http://physics.bu.edu/internal/events/show/2091
SUMMARY:Fault-Tolerant Dynamic Hamiltonian Engineering of Spin Ensembles
DESCRIPTION:Featuring Joonhee Choi\, Harvard University\nHosted by: Alexand
	er Sushkov\n\nPart of the Biophysics/Condensed Matter Seminar Series.\n\nRo
	bust control of quantum dynamics lies at the heart of many applications of 
	quantum physics\, ranging from quantum metrology to many-body quantum simul
	ations. Periodic (Floquet) driving is a powerful tool for engineering bare 
	system Hamiltonians into desired target Hamiltonians while suppressing unwa
	nted coupling to the environment. However\, the fidelity of such Hamiltonia
	n engineering is typically limited due to imperfections and inhomogeneities
	 both in the system itself and in the manipulation of the quantum state. Ro
	bust ensemble spin engineering in disordered systems with strong interactio
	n and imperfect spin control thus remains an open challenge. We introduce a
	 powerful framework for the design of pulse sequences that are fault-tolera
	nt to imperfections\, for reliable and efficient quantum control of interac
	ting many-body systems. Our formalism treats leading order imperfection eff
	ects in a simple fashion and uses a description of the system based on time
	-domain transformations of the S^z Pauli spin operator. We use the formalis
	m to design control sequences for the protection of quantum coherence\, for
	 optimal quantum sensing and for the simulation of engineered many-body Ham
	iltonians\, all realized in the presence of interactions and imperfections.
	 Our method is applicable to a wide range of physical systems with differen
	t dominant energy scales and we demonstrate its efficacy by implementing ro
	bust sequences in a dense ensemble of nitrogen-vacancy centers in diamond.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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