![]() The two qubits are coupled to each other, and each one is also coupled to a "lossy" object, such as a resonator, that experiences photon loss. The new passive error correction circuit consists of just two primary qubits, in contrast to the 10 or more qubits required in most active approaches. While this paper is a theoretical blueprint, it can be built with current technology and doesn't require any new insights to make it a reality." "Also, the error correction is fully passive-unwanted error states are quickly repaired by engineered dissipation, without the need for an external computer to watch the circuit and make decisions. "The most interesting thing about my work is that it shows just how simple and small a fully error corrected quantum circuit can be, which is why I call the device the 'Very Small Logical Qubit,'" Kapit told. ![]() Rather than actively measuring the system, the new method passively and autonomously suppresses and corrects errors, using relatively simple devices and relatively little computing power. His method takes advantage of a recently discovered unexpected benefit of quantum noise: when carefully tuned, quantum noise can actually protect qubits against unwanted noise. In a new paper published in Physical Review Letters, Eliot Kapit, an assistant professor of physics at Tulane University in New Orleans, has proposed a different approach to quantum error correction. ![]() These approaches typically have a very large overhead, where a large portion of the computing power goes to correcting errors. ![]() Most of them work by repeatedly making measurements on the system to detect errors and then correct the errors before they can proliferate. In order to flip the qubits back to their correct states, physicists have been developing an assortment of quantum error correction techniques. ![]()
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