Spin-based single-photon transistor, dynamic random access memory, diodes, and routers in semiconductors

Chengyong Hu

Research output: Contribution to journalArticle (Academic Journal)

21 Citations (Scopus)
324 Downloads (Pure)


The realization of quantum computers and quantum Internet requires not only quantum gates and quantum memories, but also transistors at single-photon levels to control the flow of information encoded on single photons. Single-photon transistor (SPT) is an optical transistor in the quantum limit, which uses a single photon to open or block a photonic channel. In sharp contrast to all previous SPT proposals which are based on single-photon nonlinearities, here I present a novel design for a high-gain and high-speed (up to THz) SPT based on a linear optical effect - giant circular birefringence (GCB) induced by a single spin in a double-sided optical microcavity. A gate photon sets the spin state via projective measurement and controls the light propagation in the optical channel. This spin-cavity transistor can be directly configured as diodes, routers, DRAM units, switches, modulators, etc. Due to the duality as quantum gate and transistor, the spin-cavity unit provides a solid-state platform ideal for future Internet - a mixture of all-optical Internet with quantum Internet.
Original languageEnglish
Article number245307
Number of pages10
JournalPhysical Review B
Issue number24
Publication statusPublished - 14 Dec 2016


  • Optical transistor
  • optical memory
  • Optical diode
  • optical router
  • all-optical Internet
  • Quantum internet
  • quantum computer

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    Rarity, J. G. & Oulton, R.


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