Photonic transistor and router using a single quantum-dotconfined spin in a single-sided optical microcavity

Chengyong Hu

Research output: Contribution to journalArticle (Academic Journal)peer-review

29 Citations (Scopus)
267 Downloads (Pure)


The future Internet is very likely the mixture of all-optical Internet with low power consumption and quantum Internet with absolute security guaranteed by the laws of quantum mechanics. Photons would be used for processing, routing and com-munication of data, and photonic transistor using a weak light
to control a strong light is the core component as an optical analogue to the electronic transistor that forms the basis of modern electronics. In sharp contrast to previous all-optical tran-sistors which are all based on optical nonlinearities, here I introduce a novel design for a high-gain and high-speed (up to terahertz) photonic transistor and its counterpart in the quantum limit, i.e., single-photon transistor based on a linear optical effect: giant Faraday rotation induced by a single electronic spin in a singlesided optical microcavity. A single-photon or classical optical pulse as the gate sets the spin state via
projective measurement and controls the polarization of a strong light to open/block the photonic channel. Due to the duality as quantum gate for quantum information processing and transistor for optical information processing, this versatile spin-cavity quantum transistor provides a solid-state
platform ideal for all-optical networks and quantum networks.
Original languageEnglish
Article number45582
JournalScientific Reports
Publication statusPublished - 28 Mar 2017


  • Quantum Interent
  • Photonic Transistor
  • Photonic Router
  • All-optical Interent


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