Entangled-photon range finding system and method
View Patent ↗A method of determining a distance to an object is presented. A first photon and a second photon are simultaneously generated. The first photon is reflected off an object. The second photon is directed to an optical cavity. An arrival of the first photon is correlated with an arrival of the second photon, and the distance to the object is at least partially determined using the correlation.
1. A method of estimating a distance to an object, the method comprising:
generating a first photon and a second photon, the first photon and the second photon being entangled;
directing the first photon at an object;
receiving the first photon reflected off of the object;
causing the second photon to travel a known distance;
directing the first photon and the second photon to an entangled photon sensitive material;
detecting an entangled-photon absorption of the first photon and the second photon by the entangled photon sensitive material; and
estimating a distance to the object based on at least the known distance and the detecting.
2. The method of claim 1 wherein the causing the second photon to travel a known distance comprises using a bank of delays.
3. The method of claim 1 further comprising directing the first photon and the second photon to an optical cavity.
4. The method of claim 1 further comprising using an adjustable delay.
5. A system for estimating a distance to an object, the system comprising:
a source of entangled photons, the entangled photons comprising a first photon and a second photon, the first photon and the second photon being entangled;
optics configured to direct the first photon to an object;
optics configured to receive the first photon reflected off of the object;
a delay configured to cause the second photon to travel a known distance;
an entangled photon sensitive material configured to receive the first photon and the second photon;
a detector configured to produce a signal in response to an entangled-photon absorption of the first photon and the second photon by the entangled photon sensitive material; and
a processor configured to compute an estimated distance to the object based on at least the known distance and the signal.
6. The system of claim 5 wherein the delay comprises a bank of delays.
7. The system of claim 5 further comprising an optical cavity configured to receive the first photon and the second photon.
8. The system of claim 5 wherein the delay comprises an adjustable delay.