Traditional computers flag and correct their own errors, so to truly outperform them quantum computers will have to do the same – and a small one can now stop errors in any operation
Matthias Brandl/University of Innsbruck via Institute for Experimental Physicsmade of charged atoms can catch its own errors when performing any operation, a meaningful step towards more reliable and practical quantum computers.
Conventional computers routinely flag and correct their own errors, so to truly outperform them quantum computers will have to do the same. However, quantum effects can make errors cascade quickly through the qubits, or quantum bits, that make up these devices. at the University of Innsbruck in Austria and his colleagues have now built a quantum computer where any calculation is safe from errors.Any operation of a quantum computer can be broken into simpler operations called quantum gates. Applying a quantum gate to a qubit consists of changing
. The team created a set of gates that are necessary building blocks for more complicated computations and that keep even the most complex of them error-free., each made of 7 entangled ions. Two more qubits served as “flags” that let the computer know when some erroneous computation needs to be corrected.“With this universal set of gates, you can approximate every calculation that you can possibly want to do with a quantum computer,” says Postler.
While this setup may be useful for certain types of quantum computers, the difficulty in programming error correction into these devices significantly varies among quantum computer designs, says
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