Robust quantum error correction will require the development of mitigation strategies to protect multiqubit arrays from correlated errors due to particle impacts. The resulting correlated errors are explained in terms of the charging event and phonon-mediated quasiparticle generation associated with absorption of γ-rays and cosmic-ray muons in the qubit substrate. Here we characterize a superconducting multiqubit circuit and find that charge noise in the chip is highly correlated on a length scale over 600 micrometres moreover, discrete charge jumps are accompanied by a strong transient reduction of qubit energy relaxation time across the millimetre-scale chip. There are other methods to reduce decoherence, but it is believed that QEC will be present in any QC. Finally, by correcting time-correlated phase errors. Another crucial requirement is that errors cannot be correlated. Quantum Error Correction: the best hope for success. Quantum error correction protects quantum states by encoding a logical quantum bit (qubit) in. Although the Heisenberg uncertainty principle precludes simultaneous monitoring of X- and Z-flips on a single qubit, it is possible to encode quantum information in large arrays of entangled qubits that enable accurate monitoring of all errors in the system, provided that the error rate is low 1. Now, researchers at the University of WisconsinMadison have found evidence that errors are correlated across an entire superconducting quantum computing chip highlighting a problem that. Unlike classical bits, which are susceptible to only one type of error, quantum bits (qubits) are susceptible to two types of error, corresponding to flips of the qubit state about the X and Z directions. If the error probability of correlated errors drops sufficiently rapidly with the number of errors so that correlated errors with more than t errors are. The central challenge in building a quantum computer is error correction.
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