Quantum spin transistors in superconducting circuits

Understand

Transistors play a vital role in classical computers, and their quantum mechanical counterparts could potentially be as important in quantum computers.

• Where a classical transistor is operated as a switch that either blocks or allows an electric current, the quantum transistor should operate on quantum information.
• In terms of a spin model the in-going quantum information is an arbitrary qubit state (spin-1/2 state).
• In this paper, we derive a model of four qubits with Heisenberg interactions that works as a quantum spin transistor, i.e.