A $\pi$-shaped Quantum Device for Implementation of Bell States in Solid State Environment

Abstract

Electronic spin-qubit is key ingredient for quantum information processing in a solid state environment. We present a $\pi$-shaped two-qubit entanglement device capable of measuring the resultant states in Bell basis. In our device, source spins (${\uparrow }_s$ or ${\downarrow }_s$) are electrically generated and tunnelled to channel where they interact with channel spins (${\uparrow }_c$ or ${\downarrow }_c$) via exchange interaction which is responsible for 2-qubit entanglement. Electrical control over spins gives rise to the Bell states. The $U_{\sqrt{SWAP}}$ and CNOT gate operations are implemented through these Bell states for universal quantum computation. $\pi$-shaped quantum device can be used as a solid state interconnect between different parts of the circuit in integrated chips.

8 pages, 4 figures