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  • 1
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    Optimization of STIRAP-based state transfer under dissipation (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-10-03
    Description: We quantify the influence of non-adiabatic leakage and system dissipation on the transfer fidelity with generic counter-intuitive pulses. By including the dissipation of all the parties, we find that the competition between non-adiabaticity and decoherence leads to an upper bound of the transfer fidelity. Using a systematic expansion valid in the desired high-fidelity limit, we derive the upper bound as a simple function of the system cooperativity. This approach also indicates how to reach the upper bound efficiently. Our results are widely applicable to quantum state engineering and are particularly significant for solid-state devices, which typically have non-negligible dissipation of the source and target systems.
    Electronic ISSN: 1367-2630
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 2
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    Tuner control system of Spoke012 SRF cavity for C-ADS injector I (2016)
    Institute of Physics (IOP)
    Details
    Publication Date: 2016-09-03
    Description: A new tuner control system for spoke superconducting radio frequency (SRF) cavities has been developed and applied to cryomodule I of the C-ADS injector I at the Institute of High Energy Physics, Chinese Academy of Sciences. We have successfully implemented the tuner controller based on Programmable Logic Controller (PLC) for the first time and achieved a cavity tuning phase error of ±0.7° (about ±4 Hz peak to peak) in the presence of electromechanical coupled resonance. This paper presents preliminary experimental results based on the PLC tuner controller under proton beam commissioning.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 3
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    Measurement of the transfer function for a spoke cavity of C-ADS Injector I (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-04-05
    Description: The spoke cavities mounted in the China Accelerator Driven sub-critical System (C-ADS) have high quality factor ( Q ) and very small bandwidth, making them very sensitive to mechanical perturbations, whether external or self-induced. The transfer function is used to characterize the response of the cavity eigenfrequency to the perturbations. This paper describes a method to measure the transfer function of a spoke cavity. The measured Lorentz transfer function shows there are 206 Hz and 311 Hz mechanical eigenmodes excited by Lorentz force in the cavity of C-ADS, and the measured piezo fast tuner transfer function shows there are 12 mechanical eigenmodes from 0 to 500 Hz. According to these results, some effective measures have been taken to weaken the influence of helium pressure fluctuation, avoid mechanical resonances and improve the reliability of the RF system.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 4
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    Charmed baryon decay asymmetry in e + e − annihilation (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-02-21
    Description: We propose to measure the decay asymmetry parameters in the hadronic weak decays of singly charmed baryons, such as ##IMG## [http://ej.iop.org/images/1674-1137/41/2/023106/cpc20170209ieqn1.gif] ,Σ 0 π + ,pK̄ 0 , ##IMG## [http://ej.iop.org/images/1674-1137/41/2/023106/cpc20170209ieqn2.gif] and ##IMG## [http://ej.iop.org/images/1674-1137/41/2/023106/cpc20170209ieqn3.gif] . The joint angular formulae for these processes are presented, and are used to extract the asymmetry parameters in e + e − annihilation data. Base on the current ##IMG## [http://ej.iop.org/images/1674-1137/41/2/023106/cpc20170209ieqn4.gif] data set collected at BESIII, we estimate the experimental sensitivities to measure the parameters α Λπ+ for ##IMG## [http://ej.iop.org/images/1674-1137/41/2/023106/cpc20170209ieqn1.gif] , α
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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