A new study reports that a simple superconducting diode can create directional quantum gates and steer entanglement between qubits. If it scales, it could lead to the development of smaller, more efficient quantum processors.
In the pre-print server arXiv , a UCLA research team describe a superconducting device that uses an asymmetric SQUID — which is a loop built from a superconducting device made of two superconductors separated by a thin barrier, called Josephson junctions — to control the direction of quantum signals using a single magnetic-flux line. The team reports that this diode can shift a resonator’s frequency depending on signal direction, induce one-way interactions between qubits and create Bell states selectively.
The team’s findings suggest that a hardware-based approach to nonreciprocity — or, the ability to treat signals differently depending on the direction they travel — could make it easier to route signals and protect qubits without the bulky components found in today’s machines. They add that this could lead to more scalable quantum systems.
To read more, click here