Quantum computation

摘要

The invention provides a system and method for quantum computation comprising the steps of defining a Hilbert space to represent a physical quantum mechanical system; selecting a set of quantum observables for said system; selecting a subspace of said Hilbert space in which all states representing said quantum mechanical system have the same eigenvalue; and storing information in or processing information using said subspace. In addition, the invention provides a system and method for quantum computation, comprising defining a Hilbert space to represent a physical quantum mechanical system; selecting a subspace of said Hilbert space in which the quantum mechanical state of the physical system is decoherence free; and processing quantum information using the quantum mechanical system by controlling only multi body interactions.