Macroscopic Quantum Resonance of Coupled Flux Qubits; A Quantum Computation Scheme
Hide Akisato
Abstract
We show that a superconducting circuit containing two loops, when treated with Macroscopic Quantum Coherence (MQC) theory, constitutes a complete two-bit quantum computer. The manipulation of the system is easily implemented with alternating magnetic fields. A universal set of quantum gates is deemed available by means of all unitary single bit operations and a controlled-not (cnot) sequence. We use multi-dimensional MQC theory and time-dependent first order perturbation theory to analyze the model. Our calculations show that a two qubit arrangement, each having a diameter of 200nm, operating in the flux regime can be operated with a static magnetic field of 0.1T, and an alternating dynamic magnetic field of amplitude 1 Gauss and frequency 10Hz. The operational time τop is estimated to be 10ns.
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