Justin Dressel (Chapman University) | Quanta Seminar

Continuous Quantum Error Correction Quantum error correction is traditionally executed in discrete repeating cycles, where errors are digitized and detected by projective multi-qubit parity measurements. These stabilizing parity measurements are usually implemented with entangling gates and projective measurements on extra ancillary qubits. As an alternative implementation, we explore the use of continuous measurements to directly monitor the needed parities, eliminating the need for entangling gates, ancilla qubits, and their associated errors. As a proof of principle, we implement a three-qubit bit-flip error correction code using two continuous parity measurements in a superconducting transmon processor, using an FPGA controller to actively correct bit-flip errors as they are detected. [1] https://www.nature.com/articles/s41467-022-29906-0 Quantum Information Group Website: https://www.qi.phy.cam.ac.uk/