Building scalable quantum information systems is a central challenge facing modern science. Single spins in
diamond are a promising platform for distributed quantum information networks and precision measurements.
I will discuss recent progress in this field demonstrating coherent operations with coupled electron-nuclear spin
quantum registers and nanoscale precision magnetometry. Our experiments demonstrate addressing, preparation,
and coherent control of individual nuclear spin qubits in the diamond lattice at room temperature. We have
measured spin coherence times exceeding milliseconds, and observed coherent coupling to nearby electronic and
nuclear spins. Robust initialization of a two-qubit register and transfer of arbitrary quantum states between
electron and nuclear spin qubits has been achieved. Our results show that coherent operations are possible
with individual solid-state qubits whose coherence properties approach those for isolated atoms and ions. The
resulting electron-nuclear few-qubit registers can potentially serve as small processor nodes in a quantum network
where the electron spins are coupled by optical photons.
J. R. Maze, P. Cappellaro, L. Childress, M. V. G. Dutt, J. S. Hodges, S. Hong, L. Jiang, P. L. Stanwix, J. M. Taylor, E. Togan, A. S. Zibrov, P. Hemmer, A. Yacoby, R. L. Walsworth, M. D. Lukin
The ability to sense nanotelsa magnetic fields with nanoscale spatial resolution is an outstanding technical
challenge relevant to the physical and biological sciences. For example, detection of such weak localized fields
will enable sensing of magnetic resonance signals from individual electron or nuclear spins in complex biological
molecules and the readout of classical or quantum bits of information encoded in an electron or nuclear spin
memory. Here we present a novel approach to nanoscale magnetic sensing based on coherent control of an
individual electronic spin contained in the Nitrogen-Vacancy (NV) center in diamond. At room temperature,
using an ultra-pure diamond sample, we achieve shot-noise-limited detection of 3 nanotesla magnetic fields
oscillating at kHz frequencies after 100 seconds of signal averaging. Furthermore, we experimentally demonstrate
nanoscale resolution using a diamond nanocrystal of 30 nm diameter for which we achieve a sensitivity of 0.5
microtesla / Hz1/2.
Conference Committee Involvement (10)
Advances in Photonics of Quantum Computing, Memory, and Communication XII
5 February 2019 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication XI
29 January 2018 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication X
31 January 2017 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication IX
16 February 2016 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication VIII
10 February 2015 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication VII
4 February 2014 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication VI
4 February 2013 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication V
23 January 2012 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication IV
25 January 2011 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication III
27 January 2010 | San Francisco, California, United States
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