Beamlike photon-pair generation for two-photon interference and polarization entanglement

Journal Article · Tue Feb 15 04:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.022313· OSTI ID:21537130

Lo, Hsin-Pin ^[1]; Yabushita, Atsushi; Luo, Chih-Wei ^[2]; Chen, Pochung ^[1]; Kobayashi, Takayoshi ^[2]

---

1. Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan (China)
2. Department of Electrophysics, National Chiao-Tung University, Hsinchu, 300, Taiwan (China)

Beamlike photon pairs were generated by spontaneous parametric down-conversion using a type-II {beta}-BaB{sub 2}O{sub 4} crystal. A pump laser generated photon pairs when it transmitted through the crystal and was reflected back into the crystal by a mirror to generate more photon pairs. The photon pairs generated when the pump laser first transmitted through the crystal (first photon pairs) were also reflected back into the crystal to overlap with the light path of the photon pairs generated in the second transmission of the pump laser through the crystal (second photon pairs). We observed interference between the first and second photon pairs modulated with a half period of the wavelength of the photon pairs, which demonstrates two-photon interference using the beamlike photon pairs. The fringe period confirms that the observed interference is not classical interference but quantum two-photon interference. Through rotating the angles of quarter-wave plates in the light paths of the photon pairs, we generated beamlike photon pairs with entangled polarization. The phase between the first and second photon pairs could be tuned by changing the position of mirrors reflecting the pump pulses and photon pairs. The fringes of coincidence counts showed that the beamlike photon pairs have polarization entanglement.

• OSTI ID: 21537130
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOSONS
CRYSTALS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
INTERACTIONS
INTERFERENCE
LASER MIRRORS
LASER RADIATION
LIGHT TRANSMISSION
MANY-BODY PROBLEM
MASSLESS PARTICLES
MIRRORS
OPTICAL PUMPING
PAIR PRODUCTION
PARTICLE PRODUCTION
PHOTONS
POLARIZATION
PULSES
PUMPING
QUANTUM ENTANGLEMENT
RADIATIONS
TRANSMISSION
TWO-BODY PROBLEM
VISIBLE RADIATION
WAVELENGTHS