BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:2 UID:UW-Physics-Event-6845 DTSTART:20220210T160000Z DTEND:20220210T170000Z DTSTAMP:20260414T113230Z LAST-MODIFIED:20220202T171826Z LOCATION:virtual: https://uwmadison.zoom.us/j/91283149612?pwd=MkFsY2l iaWlrNThJYjFDelpYandpQT09 SUMMARY:NISQ: Error Correction\, Mitigation\, and Noise Simulation\, R . G. Herb Condensed Matter Seminar\, Bei Zeng\, The Hong Kong Universi ty of Science and Technology DESCRIPTION:Error-correcting codes were invented to correct errors on noisy communication channels. Quantum error correction (QEC)\, however \, may have a wider range of uses\, including information transmission \, quantum simulation/computation\, and fault-tolerance. These invite us to rethink QEC\, in particular\, about the role that quantum physic s plays in terms of encoding and decoding. The fact that many quantum algorithms\, especially near-term hybrid quantum-classical algorithms\ , only use limited types of local measurements on quantum states\, lea ds to various new techniques called Quantum Error Mitigation (QEM). Th is work addresses the differences and connections between QEC and QEM\ , by examining different application scenarios. We demonstrate that QE M protocols\, which aim to recover the output density matrix\, from a quantum circuit do not always preserve important quantum resources\, s uch as entanglement with another party. We then discuss the implicatio ns of noise invertibility on the task of error mitigation\, and give a n explicit construction called quasi-inverse for non-invertible noise\ , which is trace-preserving while the Moore-Penrose pseudoinverse may not be. We also study the consequences of erroneously characterizing t he noise channels\, and derive conditions when a QEM protocol can redu ce the noise. \n \nvirtual: https://uwmadison.zoom.us/j/91283149612?p wd=MkFsY2liaWlrNThJYjFDelpYandpQT09 URL:https://www.physics.wisc.edu/events/?id=6845 END:VEVENT END:VCALENDAR