News archive - April 2016

Wednesday, April 6, 2016

First experiment to break time-reversal symmetry in quantum walks

Graphs showing results of the experiment including probabilities, a quantum circuit diagram and the continuous-time quantum walk

Imagine a movie showing particles in a gas moving and colliding with each other. Then when you play the movie backwards the velocity of the particles will be opposite, but their motion is still governed by the same laws of physics – we could just as well call the backwards film “forward” – there is no fundamental way to distinguish the arrow of time. This is called time-reversal symmetry.

Monday, April 4, 2016

Changing the colour of single photons in a diamond quantum memory

An artist’s impression of quantum frequency conversion in a diamond quantum memory.

Researchers from the Institute for Quantum Computing at the University of Waterloo and the National Research Council of Canada (NRC) have, for the first time, converted the colour and bandwidth of ultrafast single photons using a room-temperature quantum memory in diamond.

Monday, April 4, 2016

Entanglement harvesting in a vacuum

An artist's interpretation of entanglement

Entanglement is an extremely strong correlation that can exist between quantum systems. These correlations are so strong that two or more entangled particles have to be described with reference to each other, even though the individual objects may be spatially separated.

It has been shown that even if two uncorrelated quantum systems that don’t know anything about each other can still become entangled in a quantum vacuum without being limited by the speed of light.

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