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Frequency feedback for two-photon interference from separate quantum dots
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DOI：10.1103/PhysRevB.98.161302.png)
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Abstract
En 中文
We employ active feedback to stabilize the frequency of single photons emitted by two separate quantum dots to an atomic standard. The transmission of a rubidium-based Faraday filter serves as the error signal for frequency stabilization. We achieve a residual frequency deviation of <30 MHz, which is less than 1.5% of the quantum dot linewidth. Long-term stability is demonstrated by Hong-Ou-Mandel interference between photons from the two quantum dots. Their internal dephasing limits the expected visibility to V = 40%. We observe V-lock = (41 +/- 5)% for frequency-stabilized dots as opposed to V-free = (31 +/- 7)% for free-running emission. Our technique reaches the maximally expected visibility for the given system and therefore facilitates quantum networks with indistinguishable photons from distributed sources.
Keywords:
ENTANGLED PHOTON PAIRS
ON-DEMAND
PIEZOELECTRIC ACTUATORS
SINGLE PHOTONS
EMISSION
ENSEMBLE
DEVICE
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