RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

Quantum Computing in Silicon with Donor Electron Spins

March 7, 2016 - 11:00am
Speaker: 
Michelle Simmons
Institution: 
The University of New South Wales

Extremely long electron and nuclear spin coherence times have recently been demonstrated in isotopically pure Si-28 [1,2] making silicon one of the most promising semiconductor materials for spin based quantum information. The two level spin state of single electrons bound to shallow phosphorus donors in silicon in particular provide well defined, reproducible qubits [3] and represent a promising system for a scalable quantum computer in silicon. An important challenge in these systems is the realisation of an architecture, where we can position donors within a crystalline environment with approx. 20-50nm separation, individually address each donor, manipulate the electron spins using ESR techniques and read-out their spin states.

 

We have developed a unique fabrication strategy for a scalable quantum computer in silicon using scanning tunneling microscope hydrogen lithography to precisely position individual P donors in a Si crystal [4] aligned with nanoscale precision to local control gates [5] necessary to initialize, manipulate, and read-out the spin states [6]. During this talk I will focus on demonstrating spin transport [7] and single-shot spin read-out of precisely-positioned P donors in Si. I will also describe our approaches to scale up using rf reflectometry [8] and the investigation of 3D architectures for implementation of the surface code [9].

 

[1] K. Saeedi et al., Science 342, 130 (2013).

[2] J. T. Muhonen et al., Nature Nanotechnology 9, 986 (2014).

[3] B.E. Kane, Nature 393, 133 (1998).

[4] M. Fuechsle et al., Nature Nanotechnology 7, 242 (2012).

[5] B. Weber et al., Science 335, 6064 (2012).

[6] H. Buch et al., Nature Communications 4, 2017 (2013).

[7] B. Weber et al., Nature Nanotechnology 9, 430 (2014).

[8] M.G. House et al., Nature Communications 6, 8848 (2015)

[9] C. Hill et al., Science Advances 1, e1500707 (2015).

CSS 2400
College Park, MD 20742

Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to jqi-comm@umd.edu