Design and low-temperature characterization of a tunable microcavity for diamond-based quantum networks

Bogdanovic, Stefan; Dam, Suzanne B. van; Bonato, Cristian; Coenen, Lisanne C.; Zwerver, Anne-Marije J.; Hensen, B. J.; Liddy, Madelaine S. Z.; Fink, Thomas; Reiserer, Andreas; Lončar, Marko; Hanson, Ronald K.

doi:10.1063/1.4982168

Cited by 55 publications

(53 citation statements)

References 34 publications

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“…It can be observed in figures 2(a)-(d) that the shape of certain contours is very similar across different measurements, and that the width of the contour lines increases continuously with increasing q. Figure 2(f) shows the superposition of measurements taken at mode orders q=11, 12,14,16,22,24,28,38. Remarkably, the individual measurements combine to a consistent isocontour map.…”

Section: Transverse-mode Resonance Isocontoursmentioning

confidence: 77%

Transverse-mode coupling effects in scanning cavity microscopy

et al. 2019

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Tunable open-access Fabry-Pérot microcavities enable the combination of cavity enhancement with high resolution imaging. To assess the limits of this technique originating from background variations, we perform high-finesse scanning cavity microscopy of pristine planar mirrors. We observe spatially localized features of strong cavity transmission reduction for certain cavity mode orders, and periodic background patterns with high spatial frequency. We show in detailed measurements that the localized structures originate from resonant transverse-mode coupling and arise from the topography of the planar mirror surface, in particular its local curvature and gradient. We further examine the background patterns and find that they derive from non-resonant mode coupling, and we attribute it to the micro roughness of the mirror. Our measurements and analysis elucidate the impact of imperfect mirrors and reveal the influence of their microscopic topography. This is crucial for the interpretation of scanning cavity images, and could provide relevant insight for precision applications such as gravitational wave detectors, laser gyroscopes, and reference cavities.

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Section: Transverse-mode Resonance Isocontoursmentioning

confidence: 77%

Transverse-mode coupling effects in scanning cavity microscopy

et al. 2019

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“…Closed-cycle cryostats allow for stable long-term operation, but also induce extra vibrations from their pulse-tube operation. In setups specifically designed to mitigate vibrations passively [20] vibrations modulate the cavity length over a range with a standard deviation of approximately 0.1 nm. Here we discuss how to make a cavity perform optimally in the presence of such vibrations.…”

Section: Clipping Lossesmentioning

confidence: 99%

“…Secondly, we consider a design that enables long uninterrupted measurements at cryogenic temperatures, potentially at a remote location with no easy access (such as a data center), through the use of a closed-cycle cryostat. The vibrations induced by the cryostatʼs pulse tube can be largely mitigated passively [20]. Active stabilisation of Fabry-Perot cavities has been demonstrated [21,22], including at a high bandwidth [23,24], however these results have not yet been extended to operation in a pulse-tube cryostat.…”

Section: Introductionmentioning

confidence: 99%

“…Active stabilisation of Fabry-Perot cavities has been demonstrated [21,22], including at a high bandwidth [23,24], however these results have not yet been extended to operation in a pulse-tube cryostat. In the simulations in this manuscript we therefore assume that vibrations lead to passively stabilised cavity length deviations of 0.1 nm RMS [20]. While these boundary conditions influence the simulated maximally achievable probability to detect a ZPL photon, the analytic descriptions in this manuscript are not limited to these parameter regimes.…”

Section: Introductionmentioning

confidence: 99%

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Optimal design of diamond-air microcavities for quantum networks using an analytical approach

2018

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Defect centres in diamond are promising building blocks for quantum networks thanks to a long-lived spin state and bright spin-photon interface. However, their low fraction of emission into a desired optical mode limits the entangling success probability. The key to overcoming this is through Purcell enhancement of the emission. Open Fabry-Perot cavities with an embedded diamond membrane allow for such enhancement while retaining good emitter properties. To guide the focus for design improvements it is essential to understand the influence of different types of losses and geometry choices. In particular, in the design of these cavities a high Purcell factor has to be weighed against cavity stability and efficient outcoupling. To be able to make these trade-offs we develop analytic descriptions of such hybrid diamond-and-air cavities as an extension to previous numeric methods. The insights provided by this analysis yield an effective tool to find the optimal design parameters for a diamond-air cavity.

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“…Leaving aside possible controversies on the precise origin of the Casimir effect [30][31][32], one can expect the structure and dynamics of the physical vacuum in the laboratory, even with a locally void setup, to be influenced by the presence of surrounding matter. The fact that quantum entanglement is being successfully checked at rather large distances [33,34] can be an indication on the propagation of signals in vacuum [15].…”

Section: The Physical Vacuum In An Expanding Universementioning

confidence: 99%

Value of H, space-time patterns, vacuum, matter, expansion of the Universe, alternative cosmologies

Gonzalez‐Mestres

2017

EPJ Web Conf.

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Abstract. To the experimental uncertainties on the present value H 0 of the LundmarkLemaître -Hubble constant, fundamental theoretical uncertainties of several kinds should also be added. In standard Cosmology, consistency problems are really serious. The cosmological constant is a source of well-known difficulties while the associated dark energy is assumed to be at the origin of the observed acceleration of the expansion of the Universe. But in alternative cosmologies, possible approaches without these problems exist. An example is the pattern based on the spinorial space-time (SST) we introduced in 1996-97 where the H t = 1 relation (t = cosmic time = age of the Universe) is automatically generated by a pre-existing cosmic geometry before standard matter and conventional forces, including gravitation and relativity, are introduced. We analyse present theoretical, experimental and observational uncertainties, focusing also on the possible sources of the acceleration of the expansion of the Universe as well as on the structure of the physical vacuum and its potential cosmological role. Particular attention is given to alternative approaches to both Particle Physics and Cosmology including possible preonic constituents of the physical vacuum and associated pre-Big Bang patterns. A significant example is provided by the cosmic SST geometry together with the possibility that the expanding cosmological vacuum releases energy in the form of standard matter and dark matter, thus modifying the dependence of the matter energy density with respect to the age and size of our Universe. The SST naturally generates a new leading contribution to the value of H. If the matter energy density decreases more slowly than in standard patterns, it can naturally be at the origin of the observed acceleration of the expansion of the Universe. The mathematical and dynamical structure of standard Physics at very short distances can also be modified by an underlying preonic structure. If preons are the constituents of the physical vacuum, as postulated two decades ago with the superbradyon (superluminal preon) hypothesis, the strongest implication would be the possibility that vacuum actually drives the expansion of the Universe. If an unstable (metastable) vacuum permanently expands, it can release energy in the form of conventional matter and of its associated kinetic energy. The SST can be the expression of such an expanding vacuum at cosmic level. We briefly discuss these and related issues, as well as relevant open questions including the problematics of the initial singularity and the cosmic vacuum dynamics in a pre-Big Bang era. The possibility to obtain experimental information on the preonic internal structure of vacuum is also considered. This paper is dedicated to the memory of Henri Poincaré

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Design and low-temperature characterization of a tunable microcavity for diamond-based quantum networks

Cited by 55 publications

References 34 publications

Transverse-mode coupling effects in scanning cavity microscopy

Transverse-mode coupling effects in scanning cavity microscopy

Optimal design of diamond-air microcavities for quantum networks using an analytical approach

Value of H, space-time patterns, vacuum, matter, expansion of the Universe, alternative cosmologies

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