Large-Scale Schrödinger-Cat States and Majorana Bound States in Coupled Circuit-QED Systems
arXiv:1207.0088 · doi:10.1103/PhysRevB.87.125404
Abstract
We have studied the low-lying excitations of a chain of coupled circuit-QED systems, and report several intriguing properties of its two nearly degenerate ground states. The ground states are Schrödinger cat states at a truly large scale, involving maximal entanglement between the resonator and the qubit, and are mathematically equivalent to Majorana bound states. With a suitable design of physical qubits, they are protected against local fluctuations and constitute a non-local qubit. Further, they can be probed and manipulated coherently by attaching an empty resonator to one end of the circuit-QED chain.
5 pages; 2 figures; incorrect references corrected; typos corrected
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Cited by in corpus (8)
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