萌妹社区

(萌妹社区Org.com) -- Ever since audiences heard Goldfinger utter the famous line, 鈥淣o, Mr. Bond; I expect you to die,鈥� as a laser beam inched its way toward James Bond and threatened to cut him in half, lasers have been thought of as white-hot beams of intensely focused energy capable of burning through anything in their path.

Now a team of Yale physicists has used lasers for a completely different purpose, employing them to cool molecules down to temperatures near what鈥檚 known as absolute zero, about -460 degrees Fahrenheit. Their new method for laser cooling, described in the online edition of the journal Nature, is a significant step toward the ultimate goal of using individual molecules as information bits in quantum computing.

Currently, scientists use either individual atoms or 鈥渁rtificial atoms鈥� as qubits, or quantum bits, in their efforts to develop quantum processors. But individual atoms don鈥檛 communicate as strongly with one another as is needed for qubits. On the other hand, artificial atoms鈥攚hich are actually circuit-like devices made up of billions of atoms that are designed to behave like a single atom鈥攃ommunicate strongly with one another, but are so large they tend to pick up interference from the outside world. Molecules, however, could provide an ideal middle ground.

鈥淚t鈥檚 a kind of Goldilocks problem,鈥� said Yale physicist David DeMille, who led the research. 鈥淎rtificial atoms may prove too big and individual atoms may prove too small, but molecules made up of a few different atoms could be just right.鈥�

In order to use molecules as qubits, physicists first have to be able to control and manipulate them鈥攁n extremely difficult feat, as molecules generally cannot be picked up or moved without disturbing their quantum properties. In addition, even at room temperature molecules have a lot of kinetic energy, which causes them to move, rotate and vibrate.

To overcome the problem, the Yale team pushed the molecules using the subtle kick delivered by a steady stream of photons, or particles of light, emitted by a laser. Using laser beams to hit the molecules from opposite directions, they were able to reduce the random velocities of the molecules. The technique is known as laser cooling because temperature is a direct measurement of the velocities in the motion of a group of molecules. Reducing the molecules鈥� motions to almost nothing is equivalent to driving their temperatures to virtually absolute zero.

While scientists had previously been able to cool individual atoms using lasers, the discovery by the Yale team represents the first time that lasers have just as successfully cooled molecules, which present unique challenges because of their more complex structures.

The team used the molecule strontium monofluoride in their experiments, but DeMille believes the technique will also prove successful with other molecules. Beyond quantum computing, laser cooling molecules has potential applications in chemistry, where near absolute zero temperatures could induce currently inaccessible reactions via a quantum mechanical process known as 鈥渜uantum tunneling.鈥� DeMille also hopes to use laser cooling to study particle physics, where precise measurements of molecular structure could give clues as to the possible existence of exotic, as of yet undiscovered particles.

鈥�Laser cooling of atoms has created a true scientific revolution. It is now used in areas ranging from basic science such as Bose-Einstein condensation, all the way to devices with real-world impacts such as atomic clocks and navigation instruments,鈥� DeMille said. 鈥淭he extension of this technique to molecules promises to open an exciting new range of scientific and technological applications.鈥�