Why ‘qudits’ (not qubits) may be the key to quantum computing

0 Posted by - 26th July 2016 - Technology

Quantum computers may promise a giant leap forward in performance and efficiency, but none of that can happen until we figure out a practical way to build them. Russian scientists just announced what they say is a major advance.

Building quantum computers is difficult because the qubits they’re made with tend to be highly unstable. Qubits are the quantum counterpart of the bits used in traditional computing. While traditional bits represent data as 0s or 1s, qubits are distinguished by what’s known as superposition, or the ability to be both 0 and 1 at once.

Superposition is the heart of quantum computing’s exciting potential, but it’s also proved a thorny challenge. While calculations require that qubits not only maintain their state but also interact with one another, the quantum objects that have been used to create qubits — ions or electrons, for example — have so far only been able to maintain a certain quantum state for a short time. In a system with dozens or hundreds of qubits, the problem gets even trickier.

That’s where physicists from the Moscow Institute of Physics and Technology and the Russian Quantum Center are proposing a different approach. Rather than trying to maintain the stability of a large qubit system, they sought instead to increase the capacity of the units doing the calculations. For that, they turned to the “qudit,” a qubit alternative.

quantum qudit ququart Moscow MIPT Moscow Institute of Physics and Technology and the Russian Quantum Center

A multilevel quantum system known as a ‘ququart.’

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