Quantum entanglement revealed at room temp in SiC wafers
The phenomenon usually requires ultra-low temperatures or high magnetic fields to survive thermodynamic disturbances and so the development is of significance for the application of entanglement to quantum computing, communications and sensing.
Entanglement is a not well-understood physical phenomenon whereby particles’ quantum states cab be inextricably linked so that a change in the state of one particle is accompanied instantaneously by a corresponding change in the state of entangled particle no matter how far apart they are; something Albert Einstein called "spooky action at a distance."
The researchers used infrared laser light to align the magnetic states of thousands of electrons and nuclei in a silicon carbide wafer and then used electromagnetic pulses to entangle them. This procedure caused pairs of electrons and nuclei in a 40 micrometer-cubic cell of the to become entangled.
The group said that quantum sensors could be made that have much higher sensitivity than non-quantum sensor. These could be entanglement-enhanced magnetic resonance imaging probes.
The work has been written up by lead author Paul Klimov, a graduate student in the Institute for Molecular Engineering, a partnership between the University of Chicago and Argonne National Laboratory. The paper “Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble,” by Paul V. Klimov, Abram L. Falk, David J. Christle, Viatcheslav V. Dobrivitski and David D. Awschalom,was published online Nov. 20 in Science Advances.
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