Condensed Matter seminar: "Quantum control and quantum error correction with superconducting circuits"

Tue, 10/11/2016 - 16:00 - 17:00
Mazyar Mirrahimi, INRIA (French Institute for Research in Computer Science and Automation)

The development of quantum Josephson circuits has created a strong expectation for reliable processing of quantum information. Active quantum error correction (QEC) is regarded as the next major step towards building a many-qubit (quantum bit) quantum processor, which is robust against dissipation/decoherence. To implement QEC, the quantum information is redundantly encoded in a high-dimensional Hilbert space of a quantum system. Next, repeated non-destructive measurements of a particular quantum observable, and a quantum feedback protocol, enable then the protection against decoherence of the information. Here, I overview a series of recent theoretical proposals, and preliminary experimental developments, to enable a hardware-efficient paradigm for quantum error correction. These proposals are based on two main ingredients: 1- encoding of information in the so-called Schr√∂dinger cat states of microwave radiation in a superconducting resonator, 2- application of passive control methods (control by interconnection, dissipativity‚Ķ), aka reservoir engineering, to stabilize a manifold of quantum states where the information is encoded.

David Rittenhouse Laboratory, 2E17 (Faculty Lounge---Note location change)