Abstract
Coherent destruction of tunneling (CDT) has been one seminal result of quantum dynamics control. Traditionally, CDT is understood as destructive interference between two intermediate transition paths near the level crossing. CDT near the level anti-crossings, especially the “locking”, has not been thoroughly explored so far. Taking chaotic microcavity as an example, here we study the inhibition of the tunneling via the strong couplings of three resonances. While the tunneling rate is only slightly affected by each strong coupling between two modes, the destructive interference between two strong couplings can dramatically improve the inhibition of the tunneling. A “locking” point, where dynamical tunneling is completely suppressed, has even been observed. We believe our finding will shed light on researches on micro- & nano-photonics.
Highlights
Correspondence and requests for materials should be addressed to Coherent destruction of tunneling in chaotic microcavities via three-state anti-crossings
The coincident changes in Q factors and far field patterns at kR, 59.16 are similar to the ‘‘locking’’ effect near level crossings, which is the complete suppression of tunneling in CDT18
The far field emissions generated by the direct tunneling should follow the evanescent escape along the tangential lines
Summary
Correspondence and requests for materials should be addressed to Coherent destruction of tunneling in chaotic microcavities via three-state anti-crossings. The coherent control of quantum dynamics has attracted considerable research attentions due to their important applications in nano-scale solid state physics[1], trapped atoms in Bose-Einstein condensation[2], localized spins in molecular magnets[3], and Copper pairs in Josephon qubits[4]. Within all these studies, CDT has been one of the remarkable results. We will take chaotic cavities as examples to discuss the possibility to inhibit the tunneling around anti-crossings with moderate coupling strength
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