TIME-RESOLVED MAGNETIC SENSING WITH ELECTRONIC SPINS IN DIAMOND

• US 20140340085A1
• Filed: 01/15/2014
• Published: 11/20/2014
• Est. Priority Date: 05/17/2013
• Status: Active Grant

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Cappellaro, Paola, Cooper-Roy, Alexandre
• Granted Patent: US 9,664,767 B2
• Time in Patent Office: Days
• US Class Current: 324/316
• CPC Class Codes: G01R 33/1284 Spin resolved measurements; Influencing spins during measurements, e.g. in spintronics devices G01R33/093 takes precedence; semiconductor devices using spin polarized carriers H01L29/66984
• CPC Class Codes: G01R 33/60 using electron paramagnetic resonance G01R33/24, G01R33/62 take precedence

Abstract

A system for performing Walsh reconstruction of time dependent fields with a quantum probe that includes a diamond structure that includes nitrogen-vacancy (NV) centers for sensing magnetic and electric fields. An arbitrary waveform generator and microwave waveguides manipulate the quantum spins in the diamond structure using a plurality of coherent control sequences to measure the arbitrary profile of time-varying magnetic fields. A laser that optically addresses the quantum spins in the diamond structure for initialization and readout.

Claims

1. A system for performing Walsh reconstruction of time dependent fields with a quantum probe comprising:

a diamond structure that includes nitrogen-vacancy (NV) centers for sensing magnetic and electric fields;

arbitrary waveform generator and microwave waveguides that manipulate the quantum spins in the diamond structure using a plurality of coherent control sequences to measure the arbitrary profile of time-varying magnetic fields; and

a laser to optically address the quantum spins in the diamond structure for initialization and readout.

2. The system of claim 1, wherein the coherent control sequences suppress decoherence.

3. The system of claim 1, wherein the coherent control sequences are implemented over the whole acquisition period defined by the specified length of the time-varying field to be measured.

4. The system of claim 1, wherein the arbitrary waveform generator and microwave waveguides produce a-pulses that effectively reverse the evolution between ±

1.

5. The system of claim 1, wherein the π

-pulses of claim 4 create control sequences that act as digital filters to extract information about the time-varying magnetic fields allowing for Walsh reconstruction to be performed.

6. The system of claim 1, wherein the Walsh reconstruction comprises successive measurements of the sensor'"'"'s state after evolution under the external fields and the control sequences, which can be used to reconstruct an N-point functional approximation to the time-varying magnetic fields by performing an inverse Walsh transform.

7. The system of claim 1, wherein the diamond structure comprises an isotopically purified diamond sample.

12. The method of claim 8, wherein the π

-pulses of claim 4 create control sequences that act as digital filters to extract information about the time-varying magnetic fields allowing for Walsh reconstruction to be performed.

8. A method of performing Walsh reconstruction of time dependent fields with a quantum probe comprising:

positioning a diamond structure that includes nitrogen-vacancy (NV) centers for sensing magnetic and electric fields;

providing a plurality of coherent control sequences to measure the arbitrary profile of time-varying magnetic fields arbitrary using waveform generator and microwave waveguides that manipulate the quantum spins in the diamond structure; and

optically addressing the quantum spins in the diamond structure for initialization and readout using a laser.

9. The method of claim 8, wherein the coherent control sequences suppress decoherence.

10. The method of claim 8, wherein the coherent control sequences are implemented over the whole acquisition period defined by the specified length of the time-varying field to be measured.

11. The method of claim 8, wherein the arbitrary waveform generator and microwave waveguides produce π

-pulses that effectively reverse the evolution between ±

1.

13. The method of claim 8, wherein the Walsh reconstruction comprises successive measurements of the sensor'"'"'s state after evolution under the external fields and the control sequences, which can be used to reconstruct an N-point functional approximation to the time-varying magnetic fields by performing an inverse Walsh transform.

14. The method of claim 8, wherein the diamond structure comprises an isotopically purified diamond sample.