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Conceptual artwork depicting a pair of entangled quantum particles. Two researchers have now developed an exact mathematical expression for the important process of entanglement distillation.

Tightening the math behind a key quantum process

An exact expression for a key process needed in many quantum technologies has been derived by a RIKEN mathematical physicist and a collaborator. This could help to guide advances in quantum technologies.

Quantum Tech

Apr 30, 20252 min read

The green laser excites charge carriers in the NV centres, which are then captured by surface states. The scanning tip moves over the surface and measures a potential difference around a NV centre. The spin states of the NV centres can be manipulated using microwaves.

An elegant method for the detection of single spins using photovoltage

Diamonds with certain optically active defects can be used as highly sensitive sensors or qubits for quantum computers, where the quantum information is stored in the electron spin state of these colour centres. However, the spin states have to be read out optically, which is often experimentally complex. Now, a team at HZB has developed an elegant method using a photo voltage to detect the individual and local spin states of these defects. This could lead to a much more comp

Quantum Tech

Apr 23, 20252 min read

First contact. A scanning tunneling microscope’s (STM’s) atomically sharp tip, made of normal-metal atoms (blue spheres), approaches a phthalocyanine molecule (blue and white peaks, representing the STM-generated map) on a superconducting lead surface (dark spheres). An electron (blue sphere with arrow above the molecule) can jump across the gap along various paths (jagged pink lines), and this jump is accompanied by the production of a hole (red sphere) that moves in the other direction, a process called Andreev reflection. Superconductivity in the lead is produced by Cooper pairs of electrons (paired spheres), some of which are generated by Andreev-reflection events.

Superconductivity traverses a single molecule bridge

Researchers have caused a material’s superconductivity to permeate into a nearby normal metal via a single molecule. They showed that this effect could be controlled and say that this control could allow the creation of so-called Majorana quasiparticles, which many research teams are exploring as future quantum bits (qubits) for quantum computers.

Quantum Tech

Apr 15, 20253 min read