Scientists take next step towards observing quantum physics in real life

April 25, 2016
Scientists take next step towards observing quantum physics in real life
An artist’s impression of the membrane coupled to a laser beam. The periodic pattern makes the device highly reflective, while the thin tethers allow for ultra-low mechanical dissipation. Credit: Felix Fricke

Small objects like electrons and atoms behave according to quantum mechanics, with quantum effects like superposition, entanglement and teleportation. One of the most intriguing questions in modern science is if large objects – like a coffee cup - could also show this behavior. Scientists at the TU Delft have taken the next step towards observing quantum effects at everyday temperatures in large objects. They created a highly reflective membrane, visible to the naked eye, that can vibrate with hardly any energy loss at room temperature. The membrane is a promising candidate to research quantum mechanics in large objects.

The team has reported their results in Physical Review Letters.

Swing

"Imagine you're given a single push on a playground swing. Now imagine this single push allows you to gleefully swing non-stop for nearly a decade. We have created a millimeter-sized version of such a swing on a silicon chip", says prof. Simon Gröblacher of the Kavli Institute of Nanoscience at the TU Delft.

Tensile stress

"In order to do this, we deposit ultra-thin films of ceramic onto silicon chips. This allows us to engineer a million psi of tensile stress, which is the equivalent of 10,000 times the pressure in a car tire, into millimeter-sized suspended membranes that are only eight times thicker than the width of DNA", explains dr. Richard Norte, lead author of the publication. "Their immense stored energies and ultra-thin geometry mean that these membranes can oscillate for tremendously long times by dissipating only small amounts of energy."

Super-mirrors

To efficiently monitor the motion of the membranes with a laser they need to be extremely reflective. In such a thin structure, this can only be achieved by creating a meta-material through etching a microscopic pattern into the membrane. "We actually made the thinnest super-mirrors ever created, with a reflectivity exceeding 99%. In fact, these membranes are also the world's best force sensors at , as they are sensitive enough to measure the gravitational pull between two people 100 km apart from each other", Richard Norte says.

Room temperture

"The high-reflectivity, in combination with the extreme isolation, allows us to overcome a major hurdle towards observing physics with massive objects, for the first time, at ", says Gröblacher. Because even a single of vibration is enough to heat up and destroy the fragile nature of large objects (in a process called decoherence), researchers have relied on large cryogenic systems to cool and isolate their devices from the heat present in our everyday environments. Creating massive oscillators which are robust to decoherence at has remained an elusive feat for physicists.

This is extremely interesting from a fundamental theoretical point of view. One of the strangest predictions of is that things can be in two places at the same time. Such 'superpositions' have now been clearly demonstrated for tiny objects such as electrons or atoms, where we now know that theory works very well.

Coffee cup

But also tells us that the same rules should also apply for macroscopic objects: a coffee cup can be on the table and in the dishwasher at the same time, or Schrödinger's cat can be in a superposition of being dead and alive. This is however not something we see in our daily lives: the coffee cup is either clean or dirty and the cat is either dead or alive. Experimentally demonstrating a proverbial cat that is simultaneously dead and alive at ambient temperatures is still an open question in . The steps taken in this research might allow to eventually observe ' cats' on everyday life scales and temperatures.

Explore further: Physicists quantify the usefulness of 'quantum weirdness'

More information: R. A. Norte et al. Mechanical Resonators for Quantum Optomechanics Experiments at Room Temperature, Physical Review Letters (2016). DOI: 10.1103/PhysRevLett.116.147202

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torbjorn_b_g_larsson
5 / 5 (1) Apr 25, 2016
"the same rules should also apply for macroscopic objects: a coffee cup can be on the table".

Not my Schroedinger cup of coffee. Now I don't know if it is java, espresso or both!
compose
Apr 25, 2016
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compose
Apr 25, 2016
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Hyperfuzzy
1 / 5 (2) Apr 25, 2016
"... electrons and atoms behave according to quantum mechanics ..." is an impossibility. Atoms and molecules might not even know Shroedinger. let us just start from there. OK? Maybe a PhD of today requires the act of putting on the robe to understand and analyze all that wore it! That is we begin logically and check syntax. ya know, kinda sciency juz say'n
Pooua
2.3 / 5 (3) Apr 25, 2016
I'm guessing that superposition of macroscopic objects leads to time travel. The ability to detect minute gravitational forces ought to lead to new imaging technologies.
crusher
2 / 5 (4) Apr 25, 2016
They claim their membrane can detect the gravitational force of two people separated by 100 km. Prove it.
antialias_physorg
5 / 5 (4) Apr 25, 2016
They claim their membrane can detect the gravitational force of two people separated by 100 km. Prove it.

Since they've already characterized/shown the sensitivity...what do you think is left to prove?
QuantumChris
1 / 5 (2) Apr 25, 2016
My book "Strange Entities" describes some macroscopic situations involving quantum processes.
Please check it out at StrangeEntities.com and have fun thinking about these ideas.
compose
Apr 25, 2016
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Bulbuzor
3 / 5 (2) Apr 25, 2016
Why no video if we can see it?
compose
Apr 26, 2016
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Hyperfuzzy
not rated yet Apr 26, 2016
vacuum fluctuations? think that the fluctuations within the mind that requires them. do the work. unnecessary! freaking magic and " ... then he pops out of the box!"

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