2026-09-19T03:26:47Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/1563022024-08-22T03:48:37Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023

Oliver, William D. Jha, Shantanu R. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science 2024-08-21T18:55:10Z 2024-08-21T18:55:10Z 2024-05 2024-07-10T12:59:41.122Z https://hdl.handle.net/1721.1/156302 Bosonic quantum error correction (QEC) encodes information in the phase space of a quantum harmonic oscillator and offers a hardware-efficient path towards faulttolerant quantum information processing. With superconducting circuits, bosonic QECusing the Gottesman-Kiteav-Preskill (GKP) encoding has been achieved using the high-Q mode of a macroscopic 3D microwave cavity controlled via fixedfrequency transmon qubits [1, 2, 3, 4, 5, 6]. To date, all previous demonstrations have been limited by bit-flips in the transmon control qubit (with typical T1 lifetimes on the order of 100 microseconds), resulting in logical lifetimes that are upper-bounded by approximately ∼ 10T1. In this thesis, we replace the transmon with a heavy-fluxonium control qubit, which has been shown to possess bit-flip lifetimes in excess of 1 millisecond [7, 8, 9, 10]. Furthermore, we propose using the asymmetrically threaded SQUID as a microwave-activated three-wave mixing coupler to yield faster GKP error-correction rates while suppressing inherited nonlinearity in our bosonic mode. As compared to direct dispersive coupling, this parametric coupling enables us to use a heavier, and therefore more bit-flip-protected, fluxonium qubit. Finally, with an accelerated error correction rate, we can use a lower-Q planar resonator to store logical quantum information in an extensible and fully 2D architecture. S.M. Massachusetts Institute of Technology In Copyright - Educational Use Permitted Copyright retained by author(s) https://rightsstatements.org/page/InC-EDU/1.0/ Extensible Platforms for Bosonic Quantum Error Correction Thesis application/pdf Master Master of Science in Electrical Engineering and Computer Science Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="3fee7477-6c65-4357-a9cc-0e0d21cae258"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Title>Extensible Platforms for Bosonic Quantum Error Correction</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2024-05</PublicationDate> <Authors> <Author> <DisplayName>Jha, Shantanu R.</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>https://rightsstatements.org/page/InC-EDU/1.0/</License> <Abstract>Bosonic quantum error correction (QEC) encodes information in the phase space of a quantum harmonic oscillator and offers a hardware-efficient path towards faulttolerant quantum information processing. With superconducting circuits, bosonic QECusing the Gottesman-Kiteav-Preskill (GKP) encoding has been achieved using the high-Q mode of a macroscopic 3D microwave cavity controlled via fixedfrequency transmon qubits [1, 2, 3, 4, 5, 6]. To date, all previous demonstrations have been limited by bit-flips in the transmon control qubit (with typical T1 lifetimes on the order of 100 microseconds), resulting in logical lifetimes that are upper-bounded by approximately ∼ 10T1. In this thesis, we replace the transmon with a heavy-fluxonium control qubit, which has been shown to possess bit-flip lifetimes in excess of 1 millisecond [7, 8, 9, 10]. Furthermore, we propose using the asymmetrically threaded SQUID as a microwave-activated three-wave mixing coupler to yield faster GKP error-correction rates while suppressing inherited nonlinearity in our bosonic mode. As compared to direct dispersive coupling, this parametric coupling enables us to use a heavier, and therefore more bit-flip-protected, fluxonium qubit. Finally, with an accelerated error correction rate, we can use a lower-Q planar resonator to store logical quantum information in an extensible and fully 2D architecture.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>