Researchers demonstrated high-visibility quantum interference between two independent semiconductor quantum dots — an important step toward scalable quantum networks. Last year’s Nobel Prize in Physics celebrated the fundamental interest of quantum entanglement, and also envisioned the potential
In a recent study, researchers achieved high-visibility quantum interference between two independent semiconductor quantum dots, a crucial development towards scalable quantum networks.
Last year’s Nobel Prize in Physics celebrated the fundamental interest of quantum entanglement, and also envisioned the potential applications in “the second quantum revolution” — a new age when we are able to manipulate the weirdness of quantum mechanics, including quantum superposition and entanglement. A large-scale and fully functional quantum network is the holy grail of quantum information sciences.
Experimental configuration of quantum interference between two independent solid-state QD single-photon sources separated by 302 km fiber. DM: dichromatic mirror, LP: long pass, BP: band pass, BS: beam splitter, SNSPD: superconducting nanowire single-photon detector, HWP: half-wave plate, QWP: quarter-wave plate, PBS: polarization beam splitter. Credit: You et al., doi 10.1117/1.AP.4.6.066003
A promising source is quantum dots , semiconductor particles of just a few nanometers. However, in the past two decades, the visibility of quantum interference between independent QDs has rarely exceeded the classical limit of 50% and distances have been limited to around a few meters or kilometers., an international team of researchers has achieved high-visibility quantum interference between two independent QDs linked with ~300 km optical fibers.
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