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BEGIN:VEVENT
DTSTAMP:20260915T073538Z
LAST-MODIFIED:20151117T155630Z
DTSTART:20151120T170000Z
DTEND:20151120T180000Z
UID:event1516@bu.edu
URL:http://physics.bu.edu/internal/events/show/1516
SUMMARY:Improving the performance of solid-state qubits near surfaces
DESCRIPTION:Featuring Yiwen Chu\, Yale University Department of Applied Phy
	sics\n\nPart of the Biophysics/Condensed Matter Seminar Series.\n\nSolid-st
	ate qubits\, which act as artificial atoms\, have many advantages over real
	 atoms or ions\, such as engineerability\, scalability\, and the lack of ne
	ed for complex trapping or cooling schemes. However\, their quantum coheren
	ce is generally limited due to the environment in which they reside. In par
	ticular\, while high-quality\, nearly flawless bulk materials can be used i
	n these qubits\, the presence of surfaces inevitably introduces imperfectio
	ns. I will give two examples of improving of qubit performance by mitigatin
	g the effect of imperfect surfaces. The first example is the nitrogen-vacan
	cy (NV) center in diamond\, where efforts toward implementing nanophotonic 
	structures for quantum communications demand high quality qubits close to t
	he surface. We show that\, with the proper treatment of materials\, it is p
	ossible to achieve lifetime limited optical coherence in near-surface NV ce
	nters. The second example involves superconducting qubits on silicon\, wher
	e micromachining techniques are used to replace lossy substrate material wi
	th a perfect dielectric – vacuum.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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