High-
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi></mml:math>
 Milligram-Scale Monolithic Pendulum for Quantum-Limited Gravity Measurements

Cataño-Lopez, S. B.; Santiago-Condori, Jordy G.; Edamatsu, Keiichi; Matsumoto, Nobuyuki

doi:10.1103/physrevlett.124.221102

Cited by 40 publications

(28 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, thermal noise represents the main disturbing and limiting factor in experiments that rely on highly sensitive mechanical and opto-mechanical systems. Examples are inertial sensors [12,13] as well as recently proposed gravitational-wave and dark matter sensors [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Power Spectral Density Analysis of Nanowire-Anchored Fluctuating Microbead Reveals a Double Lorentzian Distribution

et al. 2021

View full text Add to dashboard Cite

In this work, we investigate the properties of a stochastic model, in which two coupled degrees of freedom are subordinated to viscous, elastic, and also additive random forces. Our model, which builds on previous progress in Brownian motion theory, is designed to describe water-immersed microparticles connected to a cantilever nanowire prepared by polymerization using two-photon direct laser writing (TPP-DLW). The model focuses on insights into nanowires exhibiting viscoelastic behavior, which defines the specific conditions of the microbead. The nanowire bending is described by a three-parameter linear model. The theoretical model is studied from the point of view of the power spectrum density of Brownian fluctuations. Our approach also focuses on the potential energy equipartition, which determines random forcing parametrization. Analytical calculations are provided that result in a double-Lorentzian power density spectrum with two corner frequencies. The proposed model explained our preliminary experimental findings as a result of the use of regression analysis. Furthermore, an a posteriori form of regression efficiency evaluation was designed and applied to three typical spectral regions. The agreement of respective moments obtained by integration of regressed dependences as well as by summing experimental data was confirmed.

show abstract

Section: Introductionmentioning

confidence: 99%

Power Spectral Density Analysis of Nanowire-Anchored Fluctuating Microbead Reveals a Double Lorentzian Distribution

et al. 2021

View full text Add to dashboard Cite

show abstract

“…( 12), and |Ψ in is the initial state given in Eq. (8). In this formula, we find the controlled unitary ÛAF ,…”

Section: Objectsmentioning

confidence: 99%

“…This is attributed to the lack of theoretical and experimental approaches to connect gravitaional and quantum phenomena. However, with the recent development of various quantum technologies [5][6][7][8], there have been attempts to clarify quantum natures of gravity (for example, see [9] and the references therein, or the recent works [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]). In such works, the Bose-Marletto-Vedral (BMV) proposal [10,11], which focuses on gravity-induced entanglement, has been attracting attentions.…”

Section: Introductionmentioning

confidence: 99%

Field-induced entanglement in spatially superposed objects

Matsumura

2021

Preprint

View full text Add to dashboard Cite

We discuss the generation of field-induced entanglement between two objects each in a superposition of two trajectories. The objects have currents coupled to local quantum fields, and the currents are evaluated by using classical values associated with each trajectory of the objects. If the fields have only dynamical degrees of freedom and satisfy the microcausality condition, we show that the objects initially in a product state cannot be entangled when they are spacelike separated.This means that such quantum fields do not work as mediators to generate spacelike entanglement between the two superposed objects.

show abstract

“…A benchmark would be to prepare a quantum state in an oscillator whose mass exceeds the mass equivalent of about 20 μg of the Planck energy, which represents a plausible crossover above which quantum states have been hypothesized to decohere [14,15]. Experimental preparations have been going on to cool oscillators with these heavy effective masses towards the motional ground state [16][17][18][19][20][21]. Microwave cavity optomechanics [22] offers another possibility as a side product from the more complex scheme we discuss below.…”

Section: Introductionmentioning

confidence: 99%

Gravitational Forces Between Nonclassical Mechanical Oscillators

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

High- Q Milligram-Scale Monolithic Pendulum for Quantum-Limited Gravity Measurements

Cited by 40 publications

References 60 publications

Power Spectral Density Analysis of Nanowire-Anchored Fluctuating Microbead Reveals a Double Lorentzian Distribution

Power Spectral Density Analysis of Nanowire-Anchored Fluctuating Microbead Reveals a Double Lorentzian Distribution

Field-induced entanglement in spatially superposed objects

Gravitational Forces Between Nonclassical Mechanical Oscillators

Contact Info

Product

Resources

About