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
Transient response of an erbium-doped fiber amplifier(EDFA) is studied in an externally-modulated analog link.Double tones represented as transmitted radio frequency and dither signals are introduced.Extra modulation ...Transient response of an erbium-doped fiber amplifier(EDFA) is studied in an externally-modulated analog link.Double tones represented as transmitted radio frequency and dither signals are introduced.Extra modulation is generated owing to the EDFA’s transient response caused by a low-frequency dither signal.Therefore,the parasitic modulation is superposed to the output signals and may significantly affect in-band electrical spectra.Analytical and numerical solutions are both given,which agree well with experimental results.This work indicates that a suitable dither signal should be selected to maximize the carrier to intermodulation ratio.In-band spurious free dynamic range is optimized in the meantime.展开更多
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.
文摘Transient response of an erbium-doped fiber amplifier(EDFA) is studied in an externally-modulated analog link.Double tones represented as transmitted radio frequency and dither signals are introduced.Extra modulation is generated owing to the EDFA’s transient response caused by a low-frequency dither signal.Therefore,the parasitic modulation is superposed to the output signals and may significantly affect in-band electrical spectra.Analytical and numerical solutions are both given,which agree well with experimental results.This work indicates that a suitable dither signal should be selected to maximize the carrier to intermodulation ratio.In-band spurious free dynamic range is optimized in the meantime.
