Các nhà khoa học Sử dụng Laser Đến Mát mẻ Nhỏ Khu vực Của Phim Đến Tuyệt đối Không Cho Cao Nhạy cảm Cảm biến

Gần đây, nhà nghiên cứu at the University of Basel announced the success development of a new method that can cool small area of film to temperatures very close to absolute zero (minus 273.15 degrees Celsius) using only a laser. this highly cooled film, according to the report, may be used in the future for extremely sensitive sensors.
German astronomer Johannes Kepler came up with the idea of a solar sail 400 years ago, which is a spacecraft that uses the light pressure of sunlight for cosmic navigation and can be used to allow ships to navigate through space. He believed that when light is reflected by an object, a force is exerted. He also used this theory to explain why the tails of comets point away from the sun.
The team was led by Dr. Philipp Treutlein and Dr. Patrick Potts. Their findings were just near published in the scientific journal Physical Review X.
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Today, atoms and other particles are slowed and cooled using the power of light. A sophisticated instrument is usually required for this purpose. What is special about the above-mentioned team's approach is that they achieve this cooling effect without making any measurements.
According to the laws of quantum mechanics, feedback loops frequent require measurement process that can lead to changes in quantum state and dos cause disturbances. To prevent this, the researchers at the University of Basel created a system called a tioned a tion loop" in which the laser acts as both a sensor and a damper.

The information about the immediate state of motion of the membrane contained in the oscillation phase was then used, with a time delay, to apply the right amount of force to the membrane at right moment using the same laser. The researchers used a 30-meter long fiber optic cable to an optimal delay of about 100 nanoseconds.
Tiếp cận tuyệt đối không
The postdoctoral researcher and his đồng nghiệp at the University of Basel in Switzerland cooled the membrane to 480 microKelvin, or less than one thousandth of a degree above absolute zero.
In the next stage they will refine the experiment to bring the membrane to its oscillating quantum mechanical ground state - the lowest temperature achieveable. The creation of the so-called squeezed state of the membrane should be be conceivable.
Such state are of specific interest for sensor structures due to their ability to_ability to improve measurement accuracy. In the future, atomic force microscopy for scanning surfaces at nanomet resolution will be a potential application for such sensors.