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SEQUENCE:0
UID:UW-Physics-Event-4481
DTSTART:20170406T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T043033Z
LAST-MODIFIED:20170403T200539Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Coherent coupling between a quantum dot and a donor in silicon
 \, R. G. Herb Condensed Matter Seminar\, Patrick Harvey-Collard\, Sand
 ia National Labs
DESCRIPTION:Individual donors and quantum dots in silicon chips are us
 ed as bits of quantum information with different but complementary adv
 antages. In this work\, we show that these two qubit systems can be co
 mbined by demonstrating the coherent interaction of a 31P donor electr
 on with the electron of a metal-oxide-semiconductor quantum dot. We fo
 rm a qubit from the spin singlet and triplet states of the two-electro
 n system. We show that the donor nuclear spin drives coherent rotation
 s between the electronic qubit states through the contact hyperfine in
 teraction. This provides every key element for compact two-electron sp
 in qubits requiring only a single dot and no additional magnetic field
  gradients\, as well as a means to interact with the nuclear spin qubi
 t. This system furthermore introduces an engineered path to couple don
 ors together\, alleviating the need for challenging atomic-precision f
 abrication and providing a scalable path to multi-donor qubit systems.
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\nIn this talk\, I will also discuss our a
 dvances in engineering the valley splitting and the shell filling of Q
 Ds to overcome the system’s challenges. I will present a scheme for 
 high fidelity spin readout that combines the advantages of the Pauli b
 lockade and spin 1/2 readouts.<br>
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\nThis work w
 as performed\, in part\, at the Center for Integrated Nanotechnologies
 \, an Office of Science User Facility operated for the U.S. Department
  of Energy (DOE) Office of Science. Sandia National Laboratories is a 
 multi-program laboratory operated by Sandia Corporation\, a wholly own
 ed subsidiary of Lockheed Martin Corporation\, for the U.S. DOE under 
 contract DE-AC04-94AL85000.​<br>
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URL:https://www.physics.wisc.edu/events/?id=4481
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