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'Lattice surgery' entangles fault-tolerant topological qubits - physicsworld.com
Jan 14, 2021 1 min, 0 secs

“Lattice surgery” has been used to quantum-mechanically entangle fault-tolerant topological qubits – an achievement that could lead to the production of more reliable quantum logic gates.

In classical computers, errors can be measured and corrected, but in quantum computers the very act of measuring a quantum bit (qubit) of information causes it to collapse.

This build-up of errors puts severe limits on the size of a quantum computer and the size of the computation it can achieve.

In one of the most promising implementations, the logical qubit state is stored as the topological relationship between multiple physical qubits on the edge of a mathematical 2D lattice.

“People take a collection of physical qubits, they impose some code structure to create a logical qubit, and then they show that you can do operations on that single logical qubit,” explains Friis.

“But in order to obtain a universal gate set that will enable you to do quantum computation on any number of logical qubits, you need entangling operations on two logical qubits.”.

The researchers now hope to increase the size of the logical qubits, which would boost their robustness to errors in the physical qubits, as well demonstrating more complex interactions involving more than two qubits.

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