Charge detection enables free-electron quantum computation

Details Charge detection enables free-electron quantum computation Charge detection enables free-electron quantum computation

2004-01-12

arxiv.org/abs/quant-ph/0401066v1

Phys.Rev.Lett. 93, 020501 (2004)

Physics

Quantum Physics

5 pages including 3 figures

Scientific paper

10.1103/PhysRevLett.93.020501

It is known that a quantum computer operating on electron-spin qubits with single-electron Hamiltonians and assisted by single-spin measurements can be simulated efficiently on a classical computer. We show that the exponential speed-up of quantum algorithms is restored if single-charge measurements are added. These enable the construction of a CNOT (controlled NOT) gate for free fermions, using only beam splitters and spin rotations. The gate is nearly deterministic if the charge detector counts the number of electrons in a mode, and fully deterministic if it only measures the parity of that number.

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