“Essentially, what this paper is showing is that if a high-energy cosmic ray hits the device somewhere, it has the potential to affect everything in the device at once. Correlated errors are very difficult to correct,” said co-author DuBois, who heads LLNL’s Quantum Coherent Device Physics (QCDP) Group. “For the most part, schemes designed to correct errors in quantum computers assume that the errors across qubits are uncorrelated - they’re random. Additionally, the team linked tiny error-causing perturbations in the qubits’ charge state to the absorption of cosmic rays, a finding that already is impacting how quantum computers are designed. When a disruptive event occurs, such as a burst of energy coming from outside the system, it can affect every qubit in the vicinity of the event simultaneously, resulting in correlated errors that can span the entire system, the researchers found. In experiments performed at UW-Madison, the research team characterized a quantum testbed device, finding that fluctuations in the electrical charge of multiple quantum bits, or “qubits” - the basic unit of a quantum computer - can be highly correlated, as opposed to completely random and independent. Other co-authors included researchers at the University of Wisconsin-Madison, Fermi National Accelerator Laboratory, Google, Stanford University and international universities. This must be understood in order to build a functioning quantum system. In a new paper published in Nature and co-authored by LLNL physicist Jonathan DuBois, scientists examined quantum computing stability, particularly what causes errors and how quantum circuits react to them. Research by a Lawrence Livermore National Laboratory (LLNL) physicist and a host of collaborators is shedding new light on one of the major challenges to realizing the promise and potential of quantum computing - error correction.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |