A ‘second quantum revolution’ is underway based on our new understanding of how information can be stored and manipulated using quantum hardware. Even more remarkable than the concept of quantum computation is the concept of quantum error correction. We know that measurement disturbs a quantum state. Nevertheless, it is possible to store an unknown quantum state and if it develops errors due to imperfect hardware, we can measure and correct such errors to recover the original (and still unknown) quantum information. Recent experiments at Yale have successfully demonstrated quantum error correction that reaches the break-even point for the first time in any platform. This talk will present an elementary introduction to the field as well as an overview of recent experimental progress.
Reference: ‘Extending the lifetime of a quantum bit with error correction in superconducting circuits,' Nissim Ofek, et al., Nature 536, 441445 (2016).