Decoherence has been corroborated over the years by several experimental observations, among which it is worth mentioning its first detection obtained via cavity QED 14, 15, as well as the various laboratory tests involving superconductive devices 16, trapped ions 17 and matter-wave interferometers 18.Īpart from the domains of condensed matter and atomic physics, decoherence has been studied in more exotic and extreme contexts, ranging from particle physics to cosmological large-scale structures. Indeed, no quantum system can truly be regarded as isolated, and the entanglement shared with the environment significantly affects the outcome of local measurements, even in the circumstance in which “classical” disturbances (such as dissipation and noise) can be neglected. In broad terms, decoherence appears to be due to the inevitable interaction and the ensuing creation of entanglement between a given quantum system and the environment in which it is embedded. We discuss possible experimental tests of our model based on cavity optomechanics setups with ultracold massive molecular oscillators and we provide preliminary estimates on the values of the physical parameters needed for actual laboratory implementations.įollowing early pioneering studies 1, 2, 3, 4, the investigation of the quantum-to-classical transition via the mechanism of decoherence has become a very active area of research, both experimentally and theoretically, playing an increasingly central role in the research area on the foundations of quantum mechanics (QM) and the appearance of a classical world at the macroscopic scale, as one may gather, e.g., from the many excellent existing reviews on the subject (i.e., see for instance refs. Compared to other schemes of gravitational decoherence, we find that the decoherence rate predicted by our model is extremal, being minimal in the deep quantum regime below the Planck scale and maximal in the mesoscopic regime beyond it. Considering deformed canonical commutation relations with a fluctuating deformation parameter, we derive a Lindblad master equation that yields localization in energy space and decoherence times consistent with the currently available observational evidence. We assume a foamy quantum spacetime with a fluctuating minimal length coinciding on average with the Planck scale. Here, we introduce a decoherence process due to quantum gravity effects. Our results are relevant for ongoing efforts towardīuilding superconducting quantum annealers with increased coherence.Schemes of gravitationally induced decoherence are being actively investigated as possible mechanisms for the quantum-to-classical transition. Qubit loops, possibly due to non-local sources of flux noise or junctionĬritical-current noise. Of the dephasing time also reveals apparent noise correlation between the two Noise of control electronics used for fast annealing. In the two qubit loops, with additional contribution from the low-frequency Measured dephasing rate is primarily due to intrinsic low-frequency flux noise At higher frequencies, thermal noise in the bias line makesĪ significant contribution to the relaxation, arising from the design choice toĮxperimentally explore both fast annealing and high-frequency control. To intrinsic flux noise in the main qubit loop for qubit frequencies below The measured relaxation at the qubit symmetry point is mainly due Trappen and 21 other authors Download PDF Abstract: We present a detailed study of the coherence of a tunableĬapacitively-shunted flux qubit, designed for coherent quantum annealingĪpplications. Download a PDF of the paper titled Decoherence of a tunable capacitively shunted flux qubit, by R.
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