UNIVERSAL QUANTUM COMPUTING

摘要

The present invention is directed to systems and methods of providing universal quantum computation that avoid external control fields as sources of decoherence. The systems and methods extend the set of scalable physical platforms suitable for implementing quantum computation in solid state. The invention includes encoding logical qubits into three physical qubits-i.e. three quantum mechanical systems of two levels-and performing (1) any quantum unitary operation over a single logical qubit, and (2) a non-local ( entangling ) two-qubit unitary operation using only generalized anisotropic exchange interactions. A physical qubit is represented by two distinct electronic levels of a nanoparticle supported in a cavity. The electronic levels of the nanoparticles are manipulated by electromagnetic fields associated with pulsed laser radiation carried to the nanoparticle by corresponding optical fiber sections.