Use of nuclear spin impurities to suppress electronic spin fluctuations and decoherence in composite solid-state spin systems

Patent metadata

Field	Value
Publication number	US-9829557-B2
Application number	US-201715635701-A
Country	US
Kind code	B2
Filing date	Jun 28, 2017
Priority date	Nov 30, 2011
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A solid state electronic spin system contains electronic spins disposed within a solid state lattice and coupled to an electronic spin bath and a nuclear spin bath, where the electronic spin bath composed of electronic spin impurities and the nuclear spin bath composed of nuclear spin impurities. The concentration of nuclear spin impurities in the nuclear spin bath is controlled to a value chosen so as to allow the nuclear spin impurities to effect a suppression of spin fluctuations and spin decoherence caused by the electronic spin bath. Sensing devices such as magnetic field detectors can exploit such a spin bath suppression effect, by applying optical radiation to the electronic spins for initialization and readout, and applying RF pulses to dynamically decouple the electronic spins from the electronic spin bath and the nuclear spin bath.

First claim

What is claimed is:

1. A synthetic diamond material comprising:
a plurality of NV (nitrogen-vacancy) centers within a diamond lattice;
an electronic spin bath including a plurality of N (nitrogen) atoms disposed within the diamond lattice, the electronic spins of the N atoms configured to magnetically interact with each other and with the electronic spins of the NV centers, so as to cause spin flipping and spin decoherence of the N atom electronic spins and the NV center electronic spins; and
a nuclear spin bath including a plurality of 13 C isotopes within the diamond lattice, the nuclear spins of the 13 C isotopes configured to magnetically interact with the N atom electronic spins and with the NV center electronic spins;
wherein the concentration of the 13 C isotopes within the diamond lattice is chosen so as to allow the magnetic interactions between the 13 C nuclear spins and the N atom electronic spins to shift the energy levels of the N atom electronic spins relative to each other and remove the degeneracy in these energy levels, thereby substantially suppressing the spin flipping and spin decoherence of the N atom electronic spins and the NV center electronic spins.

2. The synthetic diamond material according to claim 1 , wherein a ratio of single substitutional nitrogen to 13 C given by [N](ppm)/ 13 C(%) is in a range 1 to 500, 10 to 400, 20 to 300, 30 to 200, 40 to 150, or 50 to 150.

3. The synthetic diamond material according to claim 1 , wherein a single substitutional nitrogen concentration is equal to or greater than 150 ppm, 200 ppm, 300 ppm, 500 ppm, 750 ppm, or 1000 ppm.

4. The synthetic diamond material according to claim 3 , wherein the single substitutional nitrogen concentration is equal to or less than 10000 ppm, 5000 ppm, 2000 ppm, or 1000 ppm.

5. The synthetic diamond material according to claim 3 , wherein a 13 C concentration is equal to or greater than 1.5%, 2%, 3%, 5%, 7%, or 10%.

6. The synthetic diamond material according to claim 4 , wherein the 13 C concentration is equal to or less than 100%, 75%, 50%, 30%, 20%, or 15%.

7. The synthetic diamond material according to claim 1 , wherein a single substitutional nitrogen concentration is equal to or greater than greater than 1 ppm, 5 ppm, 10 ppm, 20 ppm, 50 ppm, or 70 ppm.

8. The synthetic diamond material according to claim 7 , wherein the single substitutional nitrogen concentration is equal to or less than 80 ppm, 60 ppm, 40 ppm, 20 ppm, or 10 ppm.

9. The synthetic diamond material according to claim 7 , wherein a 13 C concentration is equal to or greater than 0.02%, 0.05%, 0.10%, 0.2%, 0.3%, 0.5% or 0.7%.

10. The synthetic diamond material according to claim 9 , wherein the 13 C concentration is equal to or less than 0.8%, 0.6%, 0.4%, 0.25%, 0.15%, 0.10% or 0.75%.

11. The synthetic diamond material according to claim 1 , wherein T a ratio of [NV](ppm)/[N](ppm) is equal to or greater than 1×10 −3 , 5×10 −3 , 1×10 −2 , or 5×10 −2 .

12. The synthetic diamond material according to claim 11 , wherein the ratio of [NV](ppm)/[N](ppm) is equal to or less than 1.5×10 −1 , or 1×10 −1 .

Assignees

• Walsworth Ronald L
• Bar-Gill Nir
• Belthangady Chinmay
• Pham Linh My
• Harvard College

Inventors

• Walsworth Ronald L
• Bar-Gill Nir
• Belthangady Chinmay
• Pham Linh My

Classifications

• G01R33/24

  for measuring direction or magnitude of magnetic fields or magnetic flux · CPC title

• G01R33/58 Primary

  Calibration of imaging systems, e.g. using test probes {, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material} · CPC title

• G01R33/1284 Primary

  Spin resolved measurements; Influencing spins during measurements, e.g. in spintronics devices · CPC title

• G01R33/4616

  using specific RF pulses or specific modulation schemes, e.g. stochastic excitation, adiabatic RF pulses, composite pulses, binomial pulses, Shinnar-le-Roux pulses, spectrally selective pulses not being used for spatial selection · CPC title

• G01R33/60

  using electron paramagnetic resonance (G01R33/24, G01R33/62 take precedence) · CPC title