Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Interference of Single Photons from Two Separate Semiconductor Quantum Dots



Edward B. Flagg, Andreas Muller, Sergey V. Polyakov, Alexander E. Ling, Glenn S. Solomon


We demonstrate and characterize interference between discrete photons emitted by two separate semiconductor quantum dot states in different samples excited by a pulsed laser. Their energies are tuned into resonance using strain. The photons have a total coalescence probability of 18 \% and post-selection of coincidences within a narrow time window increases the probability to 47 \%. These probabilities are reduced from unity because the coherence times are not lifetime-limited due to the presence of dephasing; the post-selection value is also reduced by the detector time-response.
Physical Review Letters


quantum dots, photon statistics, indistinguishability, interference


Flagg, E. , Muller, A. , Polyakov, S. , Ling, A. and Solomon, G. (2010), Interference of Single Photons from Two Separate Semiconductor Quantum Dots, Physical Review Letters, [online], (Accessed June 13, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created April 1, 2010, Updated November 10, 2018