快猫短视频

QUANTUM entanglement鈥攖he mysterious phenomenon that allows a quantum
state to be transmitted huge distances apparently instantaneously鈥攎ay
never allow Scotty to beam you up, but it could do wonders for chip
manufacture.

快猫短视频s in Spain and Sweden say that by using entangled photons, chip
makers may be able to overcome the physical barrier to making smaller, faster
circuits.

Microchips are made by shining light through a 鈥渕ask鈥� to project a circuit
pattern onto light-sensitive chemicals on the surface of a wafer of silicon. The
smaller these circuits can be made, the faster the chip runs and the more data
it holds. But once the circuit elements get down to sizes close to the
wavelength of light, diffraction begins to blur the circuit patterns as they are
projected.

Now a team from Sweden鈥檚 Royal Institute of Technology in Kista and
Complutense University in Madrid, led by Gunnar Bj枚rk, says that entangling
the photons used to project the circuit pattern will reduce the wavelength, so
avoiding the diffraction problem.

Entangled particles are inextricably entwined because they share the same
wave function, or quantum description, and therefore, in a sense, the same
future. The wavelength of a quantum particle is determined by its mass: the
heavier it is, the shorter its wavelength. When two similar photons become
entangled they act as a single entity with twice the mass, which halves their
wavelength.

This means that an entangled pair of photons should be able to define
features half the size of those currently possible with single photons, says
Bj枚rk. Further reductions could be achieved simply by entangling more of
them. The team describes its idea in Physical Review Letters later this
month.

鈥淚t鈥檚 a neat idea,鈥� say Peter Kok of the University of Wales, Bangor. The
technique is viable, he says, but 鈥渨e don鈥檛 know how to create the very
complicated quantum states that are required鈥�.