Rotation sensing and magnetometry using localization on a ring shaped lattice
View Patent ↗Embodiments relate to a sensor system configured to detect physical rotation, entire or relative, of one or more objects and/or their environment and/or proximity of a magnetic field, by measuring the degree of localization of a medium trapped in a ring-shaped artificial lattice. The lattice structure can be configured to comprise of lattice sites distributed with a lattice period around an azimuth of a closed ring. The site depths of the plurality of lattice sites can be configured to be modulated with a modulation period different from the lattice period to affect the onsite energies of each lattice site and the eigenstates of the system. Physical rotation of the sensor and/or the proximity of magnetic field will alter the localization properties so as to cause the degree of localization of the medium to change (e.g., the medium becomes more confined in space or more spread out in space).
1. A method for operating a sensor system, the sensor system comprising: a plurality of waveguides arranged in a circular array, with refractive indices of the plurality of waveguides modulated, to generate a ring-shaped artificial lattice structure with modulated site depths; and a detection unit including a processor configured to measure distribution of light output from the artificial lattice structure, the method comprising:
determining magnitude and direction of rotation from a resulting pattern of localization in an intensity distribution of the light after the system is subject to the rotation for a duration of time by causing the processor to:
a) establish a prior distribution for a full range of possible magnitudes and orientations of rotation;
b) establish a prior distribution for a full range of possible degrees of localization;
c) establish a probability for observing or measuring a degree of localization conditioned upon a known magnitude and orientation of rotation by propagating the medium for the duration of time subject to that magnitude and orientation of rotation; wherein:
step c) is repeated for different magnitudes and directions of rotation covering the full range established in a), at intervals that provide predetermined levels for precision and accuracy;
d) determine a magnitude and orientation of an unknown subsequent rotation of interest based on an observed or measured degree of localization after a duration of time evolution from a multiplicative product of the established prior distribution from step a) and the established conditional probability from step c), normalized by the prior distribution from step b), wherein the degree of localization is that of a distribution of intensities of light detected from the individual waveguides that form the artificial lattice structure.
2. The method of claim 1 , wherein:
steps a), b) and c) are applied repetitively and independently to a full range of durations of evolution subject to a rotation, at intervals of magnitude and direction variation of the rotation that provide predetermined levels of precision and accuracy.
3. The method of claim 1 , further comprising causing the processor to:
create conditional probability distributions of the localization subject to accommodate rotations that vary over the duration of the time evolution.
4. A method for operating a sensor system, the sensor system comprising: an array of quantum wells arranged in a circular array, with gate voltages of the quantum wells modulated, to generate a ring-shaped artificial lattice structure with modulated site depths; and a detection unit including a processor configured to measure distribution of electric current output from the artificial lattice structure, the method comprising:
determining magnitude and direction of a magnetic field from a resulting pattern of localization in a distribution of the strengths of electric currents after the system is subject to the magnetic field for a duration by causing the processor to:
a) establish a prior distribution for a full range of possible magnitudes and orientations of magnetic field;
b) establish a prior distribution for a full range of possible degrees of localization;
c) establish a probability for observing or measuring a degree of localization conditioned upon a magnitude and orientation of magnetic field by propagating the medium for the duration of time subject to the magnitude and orientation of magnetic field; wherein:
steps c) is repeated for different magnitudes and directions of magnetic fields covering the full range established in a), at intervals that provide predetermined levels for precision and accuracy;
d) determine a magnitude and orientation of an unknown subsequent magnetic field of interest based on the observed or measured degree of localization after a duration of time evolution from a multiplicative product of the established prior distribution from step a) and the established conditional probability from step c), normalized by the prior distribution from step b), wherein the degree of localization is that of a distribution of the strengths of the electric currents detected from the individual quantum wells that form the artificial lattice structure.
5. The method of claim 4 , wherein:
steps a), b) and c) are applied repetitively and independently to a full range of durations of evolution subject to a magnetic field, at intervals of magnitude and direction variation of the magnetic field that provide predetermined levels of precision and accuracy.
6. The method of claim 4 , further comprising causing the processor to:
create conditional probability distributions of the localization subject to accommodate magnetic fields that vary over the duration of the time evolution.