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Recent Progress in Quantum Computing with Optically Controlled Semiconductors

Thaddeus Ladd, Stanford University

(Session 1 : Thursday from 7:45-8:15)

Abstract. I will present two recent experimental results from the Yamamoto group at Stanford. The first is the rapid initialization and subsequent coherent manipulation of a single electron spin qubit in a self-assembled InAs quantum dot using ultra-fast laser pulses. This result demonstrates a complete single qubit gate set at the highest possible clock speed for the system. The second is the generation of indistinguishable single photons from two separate semiconductor sources based on isolated donor-bound excitons in ZnSe/ZnMgSe quantum wells. This result demonstrates a tool of great importance for linear optics quantum computing; it also shows promise for mass-production of homogeneous, optically connected semiconductor qubits. I will also briefly indicate some theoretical work on implementing all-optical quantum logic and designing a complete quantum computer architecture around these elements.