We measured experimentally the spectrum of a superconducting phase qubit.An avoided energy-level crossing is obviously observed,which is due to the coupling to a microscopic two-level system.With different theoretical...We measured experimentally the spectrum of a superconducting phase qubit.An avoided energy-level crossing is obviously observed,which is due to the coupling to a microscopic two-level system.With different theoretical methods,we simulated the spectrum,from which we can obtain the coupled system’s parameters and the coupling mechanism.展开更多
We demonstrate the effect of different coupling strengths between a microscopic two-level system(TLS)and a microwave field on the dynamics of a qubit—TLS system when the bipartite system is subject to resonant microw...We demonstrate the effect of different coupling strengths between a microscopic two-level system(TLS)and a microwave field on the dynamics of a qubit—TLS system when the bipartite system is subject to resonant microwave driving.Rabi beating with a different TLSmicrowave coupling strength is demonstrated in simulations.Entanglement,quantified by the concurrence between the qubit and TLS,both for pure states and mixed states,is simulated.When decoherence is considered,entanglement of the bipartite system oscillates with damping and exhibits entanglement sudden death and/or entanglement sudden death and revival.展开更多
文摘We measured experimentally the spectrum of a superconducting phase qubit.An avoided energy-level crossing is obviously observed,which is due to the coupling to a microscopic two-level system.With different theoretical methods,we simulated the spectrum,from which we can obtain the coupled system’s parameters and the coupling mechanism.
基金supported by the National Basic Research Program of China (2011CBA00107 and 2011CBA00202)the National Natural Science Foundation of China (61371036,11074114 and 11227904)+1 种基金the Natural Science Foundation of Jiangsu (BK2012013)the CAEP THz Science and Technology Foundation (CAEPTHZ201206)
文摘We demonstrate the effect of different coupling strengths between a microscopic two-level system(TLS)and a microwave field on the dynamics of a qubit—TLS system when the bipartite system is subject to resonant microwave driving.Rabi beating with a different TLSmicrowave coupling strength is demonstrated in simulations.Entanglement,quantified by the concurrence between the qubit and TLS,both for pure states and mixed states,is simulated.When decoherence is considered,entanglement of the bipartite system oscillates with damping and exhibits entanglement sudden death and/or entanglement sudden death and revival.
