We propose an efficient hyperentanglement source emitting photon pairs entangled in both energy and polarization. The compact electrically driven room-temperature source, based on intersubband two-photon emission from semiconductor quantum wells (QWs) exhibits pair generation rates several orders of magnitude higher than alternative conventional schemes. A theoretical formalism is derived for the calculation of photon pair generation spectra and rates. The results are presented for superlattice structures similar to quantum cascade lasers of $\mathrm{GaAs}∕\mathrm{AlGaAs}$ QWs emitting in the mid-IR and far-IR and for $\mathrm{InN}∕\mathrm{AlN}$ QW structures suitable for telecommunication wavelengths.

© 2008 Optical Society of America

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