Abstract: A quantum computing device is provided, including a plurality of spin-based quantum-dot qubits that each include one or more quantum dots. The plurality of spin-based quantum-dot qubits also each include a nanomagnet including an amorphous ferromagnetic alloy.

Abstract: A cue or golf club head having a sighting aid, a golf club having the golf club head, and uses thereof.

Abstract: System and method for confirming and transferring information from one party to another via block chain escort, using central and decentralized databases acting as online storage providers. Files are linked to cryptographic currency structures comprised of a public and private key identification processes. Locking, unlocking, retrieving, storing, confirming and transferring files requires linked association to block chain protocol measures of crypto-currency processes. Establishing file space requires that the owner links it to a centralized or decentralized peer-to-peer cryptographic block chain protocol. This secures and locks files for subsequent confirmation and transfer. Confirmation and transfer of the file is processed with a cryptographic hash function of crypto currency block chain process. The system and method requires that the transferee obtain the file using crypto currency transfer protocol.