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The realization of quantum computers and quantum Internet requires not onlyquantum gates and quantum memories, but also transistors at single-photonlevels 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 sharpcontrast to all previous SPT proposals which are based on single-photonnonlinearities, 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 gatephoton sets the spin state via projective measurement and controls the lightpropagation in the optical channel. This spin-cavity transistor can be directlyconfigured as diodes, routers, DRAM units, switches, modulators, etc. Due tothe duality as quantum gate and transistor, the spin-cavity unit provides asolid-state platform ideal for future Internet - a mixture of all-opticalInternet with quantum Internet.

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