Vibration isolation with high thermal conductance for a cryogen-free dilution refrigerator

Wit, M. de; Welker, G.; Heeck, K.; Buters, Frank; Eerkens, Hedwig; Koning, G. J. M. de; Meer, Harmen van der; Bouwmeester, Dirk; Oosterkamp, Tjerk H.

doi:10.1063/1.5066618

Cited by 31 publications

(17 citation statements)

References 47 publications

(37 reference statements)

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“…Encouragingly, in Ref. [106], a 3 kHz oscillator was successfully thermalized down to about 30 mK when filtering was installed in a dry dilution refrigerator.…”

Section: Vibration Isolationmentioning

confidence: 99%

Gravitational Forces Between Nonclassical Mechanical Oscillators

et al. 2021

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Interfacing quantum mechanics and gravity is one of the great open questions in natural science. Micromechanical oscillators have been suggested as a plausible platform to carry out these experiments. We present an experimental design aiming at these goals, inspired by Schmöle et al. [Class. Quantum Grav. 33, 125031 (2016)]. Gold spheres weighing of the order of a milligram will be positioned on large silicon nitride membranes, which are spaced at submillimeter distances from each other. These massloaded membranes are mechanical oscillators that vibrate at about 2 kHz frequencies in a drum mode. They are operated and measured by coupling to microwave cavities. First, we show that it is possible to measure the gravitational force between the oscillators at deep cryogenic temperatures, where thermal mechanical noise is strongly suppressed. We investigate the measurement of gravity when the positions of the gravitating masses exhibit significant quantum fluctuations, including preparation of the massive oscillators in the ground state, or in a squeezed state. We also present a plausible scheme to realize an experiment where the two oscillators are prepared in a two-mode squeezed motional quantum state that exhibits nonlocal quantum correlations and gravity at the same time. Although the gravity is classical, the experiment will pave the way for testing true quantum gravity in related experimental arrangements. In a proof-of-principle experiment, we operate a 1.7 mm diameter Si 3 N 4 membrane loaded by a 1.3 mg gold sphere. At a temperature of 10 mK, we observe the drum mode with a quality factor above half a million at 1.7 kHz, showing strong promise for the experiments. Following implementation of vibration isolation, cryogenic positioning, and phase noise filtering, we foresee that realizing the experiments is in reach by combining known pieces of current technology.

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“…Encouragingly, in Ref. [106], a 3 kHz oscillator was successfully thermalized down to about 30 mK when filtering was installed in a dry dilution refrigerator.…”

Section: Vibration Isolationmentioning

confidence: 99%

Gravitational Forces Between Nonclassical Mechanical Oscillators

et al. 2021

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“…The motion of the metalized membrane modulates the capacitance and in turn the resonance frequency of the microwave circuit, thereby forming a canonical electromechanical system [5,11,6]. The device is read out by inductive coupling to a coaxial transmission line and is placed on a mechanical damper, for vibration isolation [24], mounted on the mixing chamber plate of a dilution refrigerator (see Methods for details).…”

Section: Electromechanical Systemmentioning

confidence: 99%

Ground State Cooling of an Ultracoherent Electromechanical System

Seis,

Capelle,

Langman

et al. 2021

Preprint

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Cavity electromechanics relies on parametric coupling between microwave and mechanical modes to manipulate the mechanical quantum state, and provide a coherent interface between different parts of hybrid quantum systems. High coherence of the mechanical mode is of key importance in such applications, in order to protect the quantum states it hosts from thermal decoherence. Here, we introduce an electromechanical system based around a soft-clamped mechanical resonator with an extremely high Q-factor (> 10 9 ) held at very low (30 mK) temperatures. This ultracoherent mechanical resonator is capacitively coupled to a microwave mode, strong enough to enable ground-state-cooling of the mechanics (nmin = 0.76 ± 0.16). This paves the way towards exploiting the extremely long coherence times (t coh > 100 ms) offered by such systems for quantum information processing and state conversion.

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“…10 a and b. This cryostat also has the inherent benefit of lower mechanical vibrations because there is no pulse-tube cooler, from which [ 107 ] there can be a significant additional heat leak through eddy-current heating [ 79 , 88 ] and additional electrical noise [ 108 ]. The particular dilution refrigerator used for the results shown in Fig.…”

Section: On-chip Demagnetisation Refrigerationmentioning

confidence: 99%

Progress in Cooling Nanoelectronic Devices to Ultra-Low Temperatures

et al. 2020

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Here we review recent progress in cooling micro-/nanoelectronic devices significantly below 10 mK. A number of groups worldwide are working to produce submillikelvin on-chip electron temperatures, motivated by the possibility of observing new physical effects and improving the performance of quantum technologies, sensors and metrological standards. The challenge is a longstanding one, with the lowest reported on-chip electron temperature having remained around 4 mK for more than 15 years. This is despite the fact that microkelvin temperatures have been accessible in bulk materials since the mid-twentieth century. In this review, we describe progress made in the last 5 years using new cooling techniques. Developments have been driven by improvements in the understanding of nanoscale physics, material properties and heat flow in electronic devices at ultralow temperatures and have involved collaboration between universities and institutes, physicists and engineers. We hope that this review will serve as a summary of the current state of the art and provide a roadmap for future developments. We focus on techniques that have shown, in experiment, the potential to reach sub-millikelvin electron temperatures. In particular, we focus on on-chip demagnetisation refrigeration. Multiple groups have used this technique to reach temperatures around 1 mK, with a current lowest temperature below 0.5 mK.

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Vibration isolation with high thermal conductance for a cryogen-free dilution refrigerator

Cited by 31 publications

References 47 publications

Gravitational Forces Between Nonclassical Mechanical Oscillators

Gravitational Forces Between Nonclassical Mechanical Oscillators

Ground State Cooling of an Ultracoherent Electromechanical System

Progress in Cooling Nanoelectronic Devices to Ultra-Low Temperatures

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