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US 9,726,626 B2Granted
Quantum mechanical measurement device
AssigneeGeometrics, Inc.
InventorsKenneth R. Smith, Krzysztof Kiersnowski
Life of this patent
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Abstract
A quantum mechanical measurement device is provided. A spin ensemble is provided. A first light source provides a first light at a first wavelength, wherein the first light source is positioned to provide light into the spin ensemble. A detector is positioned to detect light from the spin ensemble. A modulator modulates absorption of the first light from the first light source by the spin ensemble at a frequency greater than a Larmor frequency of the spin ensemble.
Claims17
A quantum mechanical measurement device, comprising:
- a spin ensemble with a precession resonance frequency, a precession resonance period, and an absorption resonance frequency, wherein the spin ensemble is located in a closed container;
- a first light source for providing a first light at a first wavelength, wherein the first light source is positioned to illuminate and interact optically with the spin ensemble;
- a detector positioned to detect light from the spin ensemble;
- and
- a modulator for modulating a power spectrum of the first light from the first light source, generating a modulating signal as a function of time;
- wherein a power of the modulating signal in a frequency band between one-third the spin precession resonance frequency and twice the spin precession resonance frequency is less than one-half a total power, not including DC, of the modulating signal, and the power of the modulating signal has a peak at at least one frequency more than twice the spin precession resonance frequency.
3 more elements
A method for making quantum mechanical measurements, comprising:
- polarizing spins in a spin ensemble by illuminating the spin ensemble with a first light at a first wavelength, wherein the spin ensemble has a precession resonance frequency, a precession resonance period, and an absorption resonance frequency, wherein the spin ensemble is located in a closed container;
- modulating a power spectrum of the first light at the precession resonance frequency of the spin ensemble with a modulating signal as a function of time;
- wherein a power of the modulating signal in a frequency band between one-third the spin precession resonance frequency and twice the spin precession resonance frequency is less than one-half a total power, not including DC, of the modulating signal, and the power of the modulating signal has a peak at at least one frequency more than twice the spin precession resonance frequency;
- detecting light from the spin ensemble;
- and
- using the detected light to provide a quantum mechanical measurement of the quantum state of the spin ensemble.
3 more elements
A magnetometer, comprising:
- a spin ensemble with a precession resonance frequency, a precession resonance period, and an absorption resonance frequency, wherein the spin ensemble is located in a closed container;
- a first light source providing a first light at a first wavelength, wherein the first light source is positioned to illuminate at least a portion of the spin ensemble and to interact optically with the spin ensemble;
- a detector positioned to detect light from the spin ensemble;
- a controller for receiving output from the detector and determining magnetic field information from the output;
- and
- a modulator for modulating a power spectrum of the first light from the first light source, generating a modulating signal as a function of time;
- wherein a power of the modulating signal in a frequency band between one-third the precession resonance frequency and twice the precession resonance frequency is less than one-half a total power, not including DC, of the modulating signal, and the power of the modulating signal has a peak at at least one frequency more than twice the precession resonance frequency.
4 more elements
Dependencies are inferred from the claim text.