Is the photon-blockade breakdown a quantum effect? A neoclassical story
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| Format: | Preprint |
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2023
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| author | Kurkó, Árpád Német, Nikolett Vukics, András |
| author_facet | Kurkó, Árpád Német, Nikolett Vukics, András |
| contents | The photon-blockade breakdown bistability can be intuitively explained invoking the energy spectrum of the interacting qubit-mode system. Yet, the neoclassical solution of the driven-dissipative Jaynes-Cummings model has been shown to capture several key aspects of the phenomenon. In this paper, we set out to compare a fully quantum solution with the neo- and semi-classical solutions. Although the neoclassical theory is founded on the assumption of a pure partial state for the qubit, it is not simply the $γ\to 0$ limit of the semiclassical theory; the semi- vs. neo-classical duality being a case of non-commutativity of limits. Furthermore, we show that the neoclassical predictions still hold in case of a small qubit decay. Tracing the bistable behavior for different detunings, we show that it is robust over a significant range of $Δ$ values. We demonstrate that the aptitude of the neoclassical description is founded on the high quantum purity of the bright state of the photon-blockade breakdown bistability, which sharply differentiates this phenomenology from conventional optical bistability. It is thereby demonstrated that driven-dissipative dynamics can produce closely separable pure steady states in an interacting bipartite. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_08388 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Is the photon-blockade breakdown a quantum effect? A neoclassical story Kurkó, Árpád Német, Nikolett Vukics, András Quantum Physics The photon-blockade breakdown bistability can be intuitively explained invoking the energy spectrum of the interacting qubit-mode system. Yet, the neoclassical solution of the driven-dissipative Jaynes-Cummings model has been shown to capture several key aspects of the phenomenon. In this paper, we set out to compare a fully quantum solution with the neo- and semi-classical solutions. Although the neoclassical theory is founded on the assumption of a pure partial state for the qubit, it is not simply the $γ\to 0$ limit of the semiclassical theory; the semi- vs. neo-classical duality being a case of non-commutativity of limits. Furthermore, we show that the neoclassical predictions still hold in case of a small qubit decay. Tracing the bistable behavior for different detunings, we show that it is robust over a significant range of $Δ$ values. We demonstrate that the aptitude of the neoclassical description is founded on the high quantum purity of the bright state of the photon-blockade breakdown bistability, which sharply differentiates this phenomenology from conventional optical bistability. It is thereby demonstrated that driven-dissipative dynamics can produce closely separable pure steady states in an interacting bipartite. |
| title | Is the photon-blockade breakdown a quantum effect? A neoclassical story |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2310.08388 |