Using Entangled Photons for Single Photon Interference
Document Type
Oral Presentation
Campus where you would like to present
SURC Ballroom B/C/D
Start Date
21-5-2015
End Date
21-5-2015
Keywords
Entangled, Photon, Interference
Abstract
Entangled photons and single photon interference are prime examples of quantum mechanics and are useful in evaluating the theory. To find entangled photons, an apparatus was built and optimized that used heralded detection. The apparatus produced entangled photons using a pump laser producing 474 nm radiation, and a ß-Barium Borate(BBO) crystal. The entangled 948 nm photons were produced in two separate beams arbitrarily known as signal and idler photons. Each beam was detected by an avalanche photodiode (APD). When the signal photons reached the APD, electronic pulses were produced and sent through a delay line, while electronic pulses from the idler photon APD were not. Then the pulses from the APDs were used as a start and stop for a time-to-amplitude converter (TAC). A multichannel analyzer was used to evaluate the TAC spectrum, and showed a large amount of coincidences at time intervals consistent with that of the delayed signal pulses. These coincidences provide evidence that the apparatus was producing entangled photons. After the apparatus was optimized, a double slit was placed in the path of the signal photons and used to search for heralded single photon interference. The results were inconclusive within measurement uncertainty.
Recommended Citation
Zimmerer, Nathan, "Using Entangled Photons for Single Photon Interference" (2015). Symposium Of University Research and Creative Expression (SOURCE). 42.
https://digitalcommons.cwu.edu/source/2015/posters/42
Poster Number
52
Department/Program
Physics
Additional Mentoring Department
Physics
Using Entangled Photons for Single Photon Interference
SURC Ballroom B/C/D
Entangled photons and single photon interference are prime examples of quantum mechanics and are useful in evaluating the theory. To find entangled photons, an apparatus was built and optimized that used heralded detection. The apparatus produced entangled photons using a pump laser producing 474 nm radiation, and a ß-Barium Borate(BBO) crystal. The entangled 948 nm photons were produced in two separate beams arbitrarily known as signal and idler photons. Each beam was detected by an avalanche photodiode (APD). When the signal photons reached the APD, electronic pulses were produced and sent through a delay line, while electronic pulses from the idler photon APD were not. Then the pulses from the APDs were used as a start and stop for a time-to-amplitude converter (TAC). A multichannel analyzer was used to evaluate the TAC spectrum, and showed a large amount of coincidences at time intervals consistent with that of the delayed signal pulses. These coincidences provide evidence that the apparatus was producing entangled photons. After the apparatus was optimized, a double slit was placed in the path of the signal photons and used to search for heralded single photon interference. The results were inconclusive within measurement uncertainty.
Faculty Mentor(s)
Michael Braunstein