Dark state as a measurable state by a dispersive readout without a Purcell limit

Abstract

It is believed that the enhancement in qubit-resonator coupling allows a better dispersive readout but introduces greater Purcell loss. In this work, we propose that a dark mode in a coupled quantum system may violate this rule by introducing the ZZ interaction between the dark and a bright mode. The dark mode may exhibit an effective zero coupling strength, and zero Purcell loss with the resonator photons. Nevertheless, the dispersive shift is almost the same as the bright state, due to the higher order perturbation introduced by the higher excited states. Such a state demonstrates the measurability without a Purcell limit in circuit quantum electrodynamics.

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BibTeX RIS

BibTeX

@misc{chien2026dark,
  title = {{Dark state as a measurable state by a dispersive readout without a Purcell limit}},
  author = {Wei-Chen Chien and Jyh-Yang Wang and Yen-Yu Chiang and Cheng-Chengh Huang and Lih-Chieh Hsaio and Yen-Chun Chen and Cen-Shawn Wu and Chiidong Chen and Watson Kuo},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.29811},
  eprint = {2608.29811},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.29811},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Dark state as a measurable state by a dispersive readout without a Purcell limit
AU  - Wei-Chen Chien
AU  - Jyh-Yang Wang
AU  - Yen-Yu Chiang
AU  - Cheng-Chengh Huang
AU  - Lih-Chieh Hsaio
AU  - Yen-Chun Chen
AU  - Cen-Shawn Wu
AU  - Chiidong Chen
AU  - Watson Kuo
PY  - 2026
DA  - 2026/08/30
PB  - arXiv
DO  - 10.48550/arxiv.2608.29811
UR  - https://arxiv.org/abs/2608.29811
AB  - It is believed that the enhancement in qubit-resonator coupling allows a better dispersive readout but introduces greater Purcell loss. In this work, we propose that a dark mode in a coupled quantum system may violate this rule by introducing the ZZ interaction between the dark and a bright mode. The dark mode may exhibit an effective zero coupling strength, and zero Purcell loss with the resonator photons. Nevertheless, the dispersive shift is almost the same as the bright state, due to the higher order perturbation introduced by the higher excited states. Such a state demonstrates the measurability without a Purcell limit in circuit quantum electrodynamics.
ER  -

Abstract

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