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Volumn 84, Issue 1, 2011, Pages

Dynamic quantum tunneling in mesoscopic driven Duffing oscillators

Author keywords

[No Author keywords available]

Indexed keywords

BIFURCATION POINTS; DRIVING DISTANCE; DUFFING OSCILLATOR; LINEAR SCALING; MESOSCOPICS; QUANTUM TUNNELING; TUNNELING RATES;

EID: 79961116967     PISSN: 15393755     EISSN: 15502376     Source Type: Journal    
DOI: 10.1103/PhysRevE.84.011144     Document Type: Article
Times cited : (12)

References (36)
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    • Actually, in our numerical simulations, about "18" bound states will be involved in the nonlinear dynamics. We noticed that in Ref., about "60" states are involved in the dynamics, corresponding to a quasiclassical limit. While in the papers by Peano and Thorwart, where the nonlinear term of the potential is positive and, thus, can support an arbitrary number of bound states, only a few numbers of states (about "8") are involved in the dynamics, implying a "deep quantum regime." The term "mesoscopic" we used in our work basically means that the number of relevant (bound) states in the dynamics is in an intermediate range, i.e., between "a few" and "a large" number of states.
    • Actually, in our numerical simulations, about "18" bound states will be involved in the nonlinear dynamics. We noticed that in Ref., about "60" states are involved in the dynamics, corresponding to a quasiclassical limit. While in the papers by Peano and Thorwart, where the nonlinear term of the potential is positive and, thus, can support an arbitrary number of bound states, only a few numbers of states (about "8") are involved in the dynamics, implying a "deep quantum regime." The term "mesoscopic" we used in our work basically means that the number of relevant (bound) states in the dynamics is in an intermediate range, i.e., between "a few" and "a large" number of states.
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    • In this work, following Ref., we use the term "dynamic quantum tunneling" to describe the quantum transition between the metastable states in the bistable region. For a driven dynamic system, the phase space can have classically forbidden areas even in the absence of potential barriers. Quantum mechanically, however, these areas can be crossed in a process called dynamical tunneling (see and references therein). As a matter of fact, this is exactly the same process as studied in Ref., where the term "quantum activation" is employed, noting that it also describes the escape from a metastable state due to quantum fluctuations that lead to diffusion away from the metastable state and, ultimately, to transition over the classical "barrier", that is, the boundary of the basin of attraction to the metastable state.
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    • That the SAS is an approximate coherent state can be understood as follows. For a dissipative harmonic oscillator described by a Lindblad master equation, e.g., a damping optical cavity under laser driving, the stationary state is exactly a coherent state. An elegant proof for this can be found in the Ref.. For the DDO problem, since the SAS is near the bottom of the potential well where the anharmonicity is negligible, we can then expect that the SAS is an approximate coherent state.
    • That the SAS is an approximate coherent state can be understood as follows. For a dissipative harmonic oscillator described by a Lindblad master equation, e.g., a damping optical cavity under laser driving, the stationary state is exactly a coherent state. An elegant proof for this can be found in the Ref.. For the DDO problem, since the SAS is near the bottom of the potential well where the anharmonicity is negligible, we can then expect that the SAS is an approximate coherent state.


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