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A universal quantum processor already exists and just waits for the proper programming
Journal of Physics B: Atomic, Molecular and Optical Physics. 2018. Vol. 51. No. 2. P. 02LT01.
Akulin
A possibility of performing the C-NOT gate operation at the ground and the first excited states of two harmonic oscillators interacting via a two-level system subject to complete control is demonstrated. The system resembles Turing machine, where the result of interaction between oscillators and the two level system is restricted to a certain fixed unitary transformation matrix, while all the control required for the implementation of the gate is provided via manipulations with the two-level system, which remains the only fully-controllable part of the entire system. Each gate operation requires a "Turing programming", - it can be realized as a series of > 63 elementary unitary operations. The result shows a way how one can construct a quantum processor in a multimode microwave cavity equipped with a fully controlled two-level system, such as Josephson junction chip. Parameters of already existing experimental devises could allow one to perform up to 15 gate operations in an ensemble of about 10 qubits.
Priority areas:
engineering science
Language:
English
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