Quantum error detection improves accuracy of chemical calculations on a quantum computer
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Quantum error detection improves accuracy of chemical calculations on a quantum computer

  • Author(s): Urbanek, Miroslav
  • Nachman, Benjamin
  • Jong, Wibe Albert de
  • et al.
Abstract

The ultimate goal of quantum error correction is to achieve the fault-tolerance threshold beyond which quantum computers can be made arbitrarily accurate. This requires extraordinary resources and engineering efforts. We show that even without achieving full fault-tolerance, quantum error detection is already useful on the current generation of quantum hardware. We demonstrate this by executing an end-to-end chemical calculation for the hydrogen molecule encoded in the [[4, 2, 2]] quantum error-detecting code. The encoded calculation with logical qubits significantly improves the accuracy of the molecular ground-state energy.

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