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Möttönen believes this method will dramatically speed up quantum computers, as well as eliminating the need for time-consuming error-correction checks. After the operation is completed, the new method quickly resets the qubits so the next quantum calculation can be started. Möttönen and associates adjust the coherence time to the length of a particular quantum operation, always guaranteeing the operation does not exceed the capabilities of the environment around the quantum gates in use, thus avoiding errors from premature decoherence. With this extra control knob, the amount of dissipation and coherence can be manipulated to study the role of the environment in quantum processors and helping to make them quicker." #Quantum error correction with superconducting qubits how toMöttönnen and his team at the Aalto Center for Quantum Engineering have successfully demonstrated how to accurately control not only single quantum circuits but also their environment. Said Stefan Filipp, technical leader of Superconducting Qubit Quantum Computation at IBM Research–Zurich, "The beauty of quantum information processing is the exquisite control that has been gained over complex quantum systems in the last decades. These researchers and collaborators are focused on eliminating one of the primal sources of quantum errors: by controlling the length of coherence and precise time of decoherence, quantum calculations become more reliable, decreasing the need for error-correction circuits that fix the problem of premature decoherence. Most of the efforts of quantum researchers so far have been on how to extend coherence as long as possible, a noble endeavor but not the whole story, according to Mikko Möttönen, senior scientist and group leader of the Center for Quantum Engineering at Finland's Aalto University, who worked on this with Matti Silveri of Finland's University of Oulu. In quantum calculations, qubits superimpose values of one and/or zero to speed up a calculation, collapsing into the answer as the last step. #Quantum error correction with superconducting qubits codeOur work demonstrates each key aspect of the $\!]$ code and verifies the viability of experimental realization of quantum error correcting codes with superconducting qubits.A new technique could reduce or eliminate the need for quantum error correction.Īrguably quantum computing's biggest challenge is error correction, since qubits-the quantum equivalents of digital ones and zeros-can prematurely collapse into an ordinary digital bit during a quantum calculation. Finally, we realise the decoding circuit and recover the input state with an overall fidelity of $74.5(6)\%$, in total with $92$ gates. We further implement logical Pauli operations with a fidelity of $97.2(2)\%$ within the code space. Then, the arbitrary single-qubit errors introduced manually are identified by measuring the stabilizers. The encoded states are prepared with an average fidelity of $57.1(3)\%$ while with a high fidelity of $98.6(1)\%$ in the code space. In the experiment, having optimised the encoding circuit, we employ an array of superconducting qubits to realise the $\!]$ code for several typical logical states including the magic state, an indispensable resource for realising non-Clifford gates. To address this challenge, we experimentally realise the $\!]$ code, the so-called smallest perfect code that permits corrections of generic single-qubit errors. #Quantum error correction with superconducting qubits verificationDespite tremendous experimental efforts in the study of quantum error correction, to date, there has been no demonstration in the realisation of universal quantum error correcting code, with the subsequent verification of all key features including the identification of an arbitrary physical error, the capability for transversal manipulation of the logical state, and state decoding. ![]() Quantum error correction is an essential ingredient for universal quantum computing. ![]()
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