Spin-wave utilization in a quantum computer - art. no. 062304

We propose a quantum computer scheme using spin waves for quantum-informati on exchange. We demonstrate that spin waves in the antiferromagnetic layer grown on silicon may be used to perform single-qubit unitary transformation s together with two-qubit operations during the cycle of computation. The m ost attractive feature of the proposed scheme is the possibility of random access to any qubit and, consequently, the ability to recognize two qubit g ates between any two distant qubits. Also, spin waves allow us to eliminate the use of a strong external magnetic field and microwave pulses. By estim ate, the proposed scheme has as high as 10(4) ratio between quantum system coherence time and the time of a single computational step.