Notch filtering the nuclear environment of a spin qubit.
Electron spins in gate-defined quantum dots provide a promising platform for quantum computation. In particular, spin-based quantum computing in gallium arsenide takes advantage of the high quality of semiconducting materials, reliability in fabricating arrays of quantum dots and accurate qubit operations. However, the effective magnetic noise arising from the hyperfine interaction with uncontrolled nuclear spins in the host lattice constitutes a major source of decoherence. Low-frequency nuclear noise, responsible for fast (10 ns) inhomogeneous dephasing, can be removed by echo techniques. High-frequency nuclear noise, recently studied via echo revivals, occurs in narrow-frequency bands related to differences in Larmor precession of the three isotopes69Ga,71Ga and75As (refs 15,16,17). Here, we show that both low- and high-frequency nuclear noise can be filtered by appropriate dynamical decoupling sequences, resulting in a substantial enhancement of spin qubit coherence times. Using nuclear notch filtering, we demonstrate a spin coherence time (T2) of 0.87 ms, five orders of magnitude longer than typical exchange gate times, and exceeding the longest coherence times reported to date in Si/SiGe gate-defined quantum dots.
Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Copenhagen 2100, Denmark.
Filip K
FK
Malinowski
Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Copenhagen 2100, Denmark.
Frederico
F
Martins
Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Copenhagen 2100, Denmark.
Peter D
0000-0003-3111-5516
PD
Nissen
Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA.|Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.
Edwin
E
Barnes
Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland.
Łukasz
Ł
Cywiński
Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Copenhagen 2100, Denmark.|Niels Bohr International Academy, Niels Bohr Institute, Copenhagen 2100, Denmark.
Mark S
MS
Rudner
Department of Physics and Astronomy, Birck Nanotechnology Center, and Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA.
Saeed
S
Fallahi
Department of Physics and Astronomy, Birck Nanotechnology Center, and Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA.|School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
Geoffrey C
GC
Gardner
Department of Physics and Astronomy, Birck Nanotechnology Center, and Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA.|School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
Michael J
MJ
Manfra
Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Copenhagen 2100, Denmark.
Charles M
CM
Marcus
Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Copenhagen 2100, Denmark.
Ferdinand
F
Kuemmeth
Nature. 2012 Jan 18;481(7381):344-7
22258613
Science. 2011 Sep 2;333(6047):1269-72
21817015
Phys Rev Lett. 2016 Mar 18;116(11):116801
27035316
Nature. 2015 Oct 15;526(7573):410-4
26436453
Science. 2006 Oct 13;314(5797):281-5
16973839
Phys Rev Lett. 2013 Apr 5;110(14):146804
25167023
Proc Natl Acad Sci U S A. 2016 Oct 18;113(42):11738-11743
27698123
Phys Rev Lett. 2008 Dec 5;101(23):236803
19113577
Science. 2005 Sep 30;309(5744):2180-4
16141370
Phys Rev Lett. 2010 Dec 31;105(26):266808
21231704
Phys Rev Lett. 2009 Oct 16;103(16):160503
19905680
Phys Rev Lett. 2012 Feb 24;108(8):086802
22463554
Phys Rev Lett. 2009 Feb 6;102(5):057601
19257553
Phys Rev Lett. 2011 Dec 2;107(23):230501
22182074
Sci Adv. 2015 May 29;1(4):e1500214
26601186
Nat Commun. 2016 Apr 15;7:11170
27079269
Science. 2007 Nov 30;318(5855):1430-3
17975030