Engineered Dissipation as Your Side-kick: A Hybrid Scheme for Quantum Error Correction.

The main adversary when trying to harness the power of quantum computation is the ever-present occurrence of errors and decoherence. These effects constantly conspire to alter the state of the quantum bits of your quantum computer, thereby slowly corrupting the stored information and messing up the output of your beautiful quantum algorithms. Luckily, a plethora of quantum error correcting codes have been invented to help mitigate this problem. One interesting branch of this field is the study of autonomous error correction codes that attempt to fight fire with fire by engineering dynamics and dissipation of systems so that they become able to detect and correct errors on their own, without relying on an external experimenter doing costly measurement- and correction-steps. In this talk, we present a scheme that combine these ideas with traditional measurement-based error correction into a 6-qubit hybrid scheme capable of protecting qubits from photon-loss and dephasing errors, achieving 10-fold improvements in dephasing times and 5-fold improvements to relaxation times for realistic superconducting-qubit parameters and noise while employing only relatively simple local 2-qubit interactions.