Magnetic sensing and imaging using interactions between surface electron spins and solid state spins

• US 9,891,297 B2
• Filed: 03/13/2015
• Issued: 02/13/2018
• Est. Priority Date: 03/13/2015
• Status: Active Grant

• Current Assignee: President and Fellows of Harvard College (Harvard Corporation)
• Original Assignee: President and Fellows of Harvard College (Harvard Corporation)
• Inventors: Sushkov, Alexander, Lovchinsky, Igor, Chisholm, Nicholas, Walsworth, Ronald L., Park, Hongkun, Lukin, Mikhail D.
• Primary Examiner(s): Fuller, Rodney
• Application Number:
  US14/657,593
• Publication Number:
  US 20160266220A1
• Time in Patent Office: 1,068 Days
• Field of Search: 324304
• CPC Class Codes: G01N 24/12 by using double resonance
• CPC Class Codes: G01R 33/323 Detection of MR without the use of RF or microwaves, e.g. force-detected MR, thermally detected MR, MR detection via electrical conductivity, optically detected MR

Abstract

Systems and methods for magnetic sensing and imaging include a sensor having a network of isolated electron-spin quantum bits (qubits) disposed on the surface of the sensor; and a solid state electronic spin system disposed below the surface of the sensor, wherein the solid state electronic spin system has a spin-state dependent fluorescence; a source of light; a source of first external perturbation, wherein the source of first external perturbation generates a magnetic field; a source of second external perturbation; wherein, the source of light and the first and second external perturbations are configured to coherently and independently manipulate the spin states of at least one qubit and at least one solid state electronic spin system; and a detector to optically measure the solid-state electronic spins spin-state dependent fluorescence.

Claims

1. A system comprising:

a sensor, wherein, the sensor comprises,

a network of isolated electron-spin quantum bits (qubits) disposed on the surface of the sensor; and

a solid state electronic spin system disposed below the surface of the sensor, wherein the solid state electronic spin system has a spin-state dependent fluorescence;

a source of light;

a source of first external perturbation, wherein the source of first external perturbation generates a magnetic field;

a source of second external perturbation;

wherein, the source of light and the first and second external perturbations are configured to coherently and independently manipulate the spin states of at least one qubit and at least one solid state electronic spin system; and

a detector to optically measure the solid-state electronic spins spin-state dependent fluorescence.

2. The system of claim 1, wherein, the sensor comprises a high purity diamond crystal lattice.

3. The system of claim 2, wherein, the solid state electronic spin system is a nitrogen-vacancy (NV) spin in the high purity diamond lattice.

4. The system of claim 1, wherein, the source of second external perturbation is a radio frequency (RF) electromagnetic field source.

5. The system of claim 1, wherein, the source of second external perturbation is an electronic spin resonance (ESR) field source.

6. The system of claim 1, wherein, the detector is a CCD camera, or a photomultiplier, or a photodiode.

7. The system of claim 1, wherein, the sample to be measured is placed in contact with the surface of the sensor.

8. The system of claim 1, wherein the sample to be measured is placed in the proximity of the sensor.

9. The system of claim 1, wherein the solid state electronic spin system interacts with one qubit.

10. The system of claim 1, wherein the solid state electronic spin system interacts with multiple qubits.

11. The system of claim 1, wherein the solid state spin systems spin-dependent fluorescence is changed due to the interaction with the qubit.

12. The system of claim 11, wherein the optically pumped laser has a wavelength of 532 nm.

13. The system of claim 1, wherein the source of light is an optically pumped laser.

14. A method of manipulating a reporter spin network and a solid state electronic spin system, comprising:

applying a first pulse sequence of external perturbation to a network of isolated electron-spin quantum bits (qubits) disposed on the surface of the sensor and a solid state electronic spin system disposed below the surface of the sensor,

wherein the solid state electronic spin system has a spin-state dependent fluorescence;

applying a second pulse sequence of external perturbation to the network of isolated electron-spin quantum bits (qubits);

applying a third pulse sequence of external perturbation to the network of isolated electron-spin quantum bits (qubits) and a solid state electronic spin system disposed below the surface of the sensor;

wherein the first and the third pulse sequence of external perturbations probes the quantum state of at least one electronic-spin quantum bits using at least one shallow state electronic spin system; and

wherein, the quantum state of the reporter spin network is manipulated in the second pulse sequence of external perturbation.

15. The method of claim 14, further comprising comparing the qubit quantum states during the first and third pulse sequences of external perturbation.

16. The method of claim 14, further comprising controlling the length of the first and third pulse sequences of external perturbation, wherein the length of each pulse sequence of external perturbation is short enough for the change in the optical fluorescence of the solid state spins to be dominated by the coupling to the proximal most strongly coupled qubit.

17. The method of claim 14, further comprising controlling the length of the first and third pulse sequences of external perturbation, wherein the length of each pulse sequence of external perturbation is long enough for the change in the optical fluorescence of the solid state spins to be dominated by the coupling to multiple qubits.

18. The method of claim 14, wherein, the first pulse sequence of external perturbation of the solid state electronic spin systems comprises of a π

/2-pulse followed by a π

-pulse which is further followed by a π

/2-pulse.

19. The method of claim 14, wherein, the third pulse sequence of external perturbation of the solid state electronic spin systems comprises of a π

/2-pulse followed by a π

-pulse which is further followed by a π

/2-pulse.

20. The method of claim 14, wherein, the first pulse sequence of external perturbation of the isolated electron-spin quantum bits (qubits) comprises of a π

-pulse.

21. The method of claim 14, wherein, the third pulse sequence of external perturbation of the isolated electron-spin quantum bits (qubits) comprises of a π

-pulse.

22. The method of claim 14, wherein, the second pulse sequence of external perturbation of the isolated electron-spin quantum bits (qubits) comprises of a π

/2-pulse, followed by a π

-pulse, which is further followed by a π

/2-pulse.

23. A method of sensing, coherently coupling and imaging a nuclear spin, comprising:

providing a sample containing at least one nuclear spin in proximity to a sensor;

wherein the sensor comprises a network of isolated electron-spin quantum bits (qubits) that act as quantum reporter spins disposed on the surface of the sensor;

and another solid state electronic spin system, wherein the solid state electronic spin system has a spin-state dependent fluorescence;

exposing the sensor to light and a first and a second external perturbation energy to coherently and independently manipulate at least one electron-spin quantum bit (qubit) and at least one solid state electronic spin system;

wherein the interaction of the nuclear spin with the qubit and the interaction of the qubit with the solid state electronic spin system changes the spin-state dependent fluorescence of the solid state electronic spin;

detecting the change in the spin-state dependent fluorescence of the solid state electronic spin system; and

inferring information regarding the nuclear spins of the sample using the detected change in the spin-state dependent fluorescence of the solid state electronic spins.

24. The method of claim 23, wherein, the sensor comprises a high purity diamond crystal lattice.

25. The method of claim 24, wherein, the solid state electronic spin system is a nitrogen-vacancy (NV) spin in the high purity diamond lattice.

26. The method of claim 23, wherein, the information inferred regarding the nuclear spins of the sample is spatial data.

27. The method of claim 23, wherein, the resolution of the detection of the nuclear spin is in the nano-length scale.

28. The method of claim 23, wherein, the second external perturbation energy comprises a radio frequency (RF) electromagnetic field.

29. The method of claim 23, wherein, the second external perturbation comprises an electronic spin resonance (ESR) field.

30. The method of claim 23, wherein, the detector is a CCD camera, or a photomultiplier, or a photodiode.

31. The method of claim 23, wherein, the sample is placed in contact with the surface of the sensor.

32. The method of claim 23, wherein, manipulating at least one electron-spin quantum bit (qubit) and at least one solid state electronic spin system comprises:

applying a first pulse sequence of external perturbation energy to the network of isolated electron-spin quantum bits (qubits) that act as quantum reporter spins disposed on the surface of the sensor and the solid state electronic spin system disposed below the surface of the sensor,

wherein the solid state electronic spin system has a spin-state dependent fluorescence;

applying a second pulse sequence of external perturbation energy to only the network of isolated electron-spin quantum bits (qubits);

applying a third pulse sequence of external perturbation to the network of isolated electron-spin quantum bits (qubits) and a solid state electronic spin system disposed below the surface of the sensor;

wherein the first and the third pulse sequence of external perturbations comprises probing the quantum state of at least one electronic-spin quantum bits using at least one solid state electronic spin system; and

wherein, the quantum state of the reporter spin network is manipulated in the second pulse sequence of external perturbation.

33. The method of claim 32, further comprising comparing the reporter-spin quantum states during the first and third pulse sequence of external perturbation.

34. The method of claim 32, further comprising controlling the length of the first and third pulse sequences of external perturbation energy, wherein the length of the pulse sequence of external perturbation is short enough for the change in the optical fluorescence of the solid state spins to be dominated by the coupling to the proximal most strongly coupled reporter spin.

35. The method of claim 32, further comprising controlling the length of the first and third pulse sequences of external perturbation energy, wherein the length of the pulse sequence of external perturbation is long enough for the change in the optical fluorescence of the solid state spins to be dominated by the coupling to multiple reporter spins.

36. The method of claim 32, wherein, the first pulse sequence of external perturbation of the solid state electronic spin systems comprises of a π

/2-pulse followed by a π

-pulse which is further followed by a π

/2-pulse.

37. The method of claim 32, wherein, the third pulse sequence of external perturbation of the solid state electronic spin systems comprises of a π

/2-pulse followed by a π

-pulse which is further followed by a π

/2-pulse.

38. The method of claim 32, wherein, the first pulse sequence of external perturbation of the electron-spin quantum bits (qubits) comprises of a π

-pulse.

39. The method of claim 32, wherein, the third pulse sequence of external perturbation of the electron-spin quantum bits (qubits) comprises of a π

-pulse.

40. The method of claim 32, wherein, the second pulse sequence of external perturbation of the electron-spin quantum bits (qubits) comprises of a π

/2-pulse, followed by a π

-pulse, which is further followed by a π

/2-pulse.

41. The method of claim 23, wherein, a plurality of the qubits from the quantum reporter spin network are read out by a plurality of solid state electronic spin systems through the change of the spin-state dependent fluorescence.