Lawrence Berkeley National Laboratory
Quantum error detection improves accuracy of chemical calculations on a quantum computer
- Author(s): Urbanek, Miroslav
- Nachman, Benjamin
- Jong, Wibe Albert de
- et al.
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.