2012/07/03 by Myung-Joong Hwang, Mahn-Soo Choi · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.87.125404
published as Phys. Rev. B 87, 125404 (2013) · 5 pages; 2 figures; incorrect references corrected; typos corrected
arxiv created 2012/07/03 · arxiv updated 2016/02/23
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.