Researchers Propose Dense Qubits Using Spin Nonlinearities

Nanomechanical structures are being investigated as a means of achieving long-lived quantum excitations at radio frequencies. Their high quality factors are particularly intriguing as a medium for bosonic encoding of quantum information. However, mechanical modes typically lack the key nonlinearities needed to achieve interaction between bosonic channels, limiting their ability to scale to the many-qubit regime vital for practical quantum computing. Hamza Raniwala of the Massachusetts Institute of Technology and colleagues propose and describe a new approach for bosonic quantum information processing that uses strain-sensitive solids. Dispersive preparation of even/odd cat states now exceeds a fidelity of 0.98, a substantial improvement over previous methods reliant on larger,…