InterJournal Complex Systems, 41
Status: Accepted
Manuscript Number: [41]
Submission Date: 963011
Bulk quantum computation
Author(s): Neil Gershenfeld ,Isaac Chuang ,Seth Lloyd

Subject(s): CX.09

Category: Brief Article


A quantum computer must protect its qubits from environmentally induced decoherence, but must also make them available to external manipulation. To date, experimental approaches have attempted to satisfy these apparently contradictory constraints by carefully isolating a small number of quantum degrees of freedom that are cooled to their ground state. Beyond the significant attendant experimental difficulties, this approach does not promise to scale well to more qubits or to practically accessible hardware. We report on a very different approach, representing and manipulating quantum information in small deviations from equilibrium in the spin density matrix of a bulk thermal ensemble. This replaces complex experimental apparatus with the natural self-assembly of ordinary materials, and because of the massive redundancy the decoherence times can be very long (permitting thousands of operations).

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