ROM-based computation: quantum versus classical

Authors:
B. C. Travaglione;M. A. Nielsen;H. M. Wiseman;A. Ambainis
Affiliations:
Centre for Quantum Computer Technology, University of Queensland, St Lucia, Queensland, Australia;Centre for Quantum Computer Technology, University of Queensland, St Lucia, Queensland, Australia;Centre for Quantum Dynamics, School of Science, Griffith University, Nathan, Queensland, Australia;University of California, Berkeley, California
Venue:
Quantum Information & Computation
Year:
2002

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Abstract

We introduce a model of computation based on read only memory (ROM), which allows us to compare the space-efficiency of reversible, error-free classical computation with reversible, error-free quantum computation. We show that a ROM-based quantum computer with one writable qubit is universal, whilst two writable bits are required for a universal classical ROM-based computer. We also comment on the time-efficiency advantages of quantum computation within this model.