Demonstration of quantum volume 64 on a superconducting quantum computing system

We improve the quality of quantum circuits on superconducting quantum computing systems, as measured by the quantum volume, with a combination of dynamical decoupling, compiler optimizations, shorter two-qubit gates, and excited state promoted readout. This result shows that the path to larger quantum volume systems requires the simultaneous increase of coherence, control gate fidelities, measurement fidelities, and smarter software which takes into account hardware details, thereby demonstrating the need to continue to co-design the software and hardware stack for the foreseeable future.Comment: Fixed typo in author list. Added references [38], [49] and [52

Qiskit/qiskit: Qiskit 0.25.3

<h1>Changelog</h1> <h2>Fixed</h2> <ul> <li>Fix input normalisation of <code>transpile(initial_layout=...)</code> (backport #11031) (#11058)</li> <li>Fix calling backend.name() for backendV2 (#11065) (#11076) (#11092)</li> <li>Fix build filter coupling map with mix ideal/physical targets (#11009) (#11049)</li> <li>Emit a descriptive error when the QPY version is too new (#11094)</li> <li>BackendEstimator support BackendV2 without coupling_map (#10956) (#11006)</li> <li>Support dynamic circuit in BackendEstimator (#9700) (#10984)</li> <li>Avoid useless deepcopy of target with custom pulse gates in transpile (#10973) (#10978)</li> <li>Fix bug in qs_decomposition (#10850) (#10957)</li> </ul&gt