{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/156302"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/156302","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Extensible Platforms for Bosonic Quantum Error Correction","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_html":"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_has_math":false,"creators":["Jha, Shantanu R."],"institution":"Massachusetts Institute of Technology","degree_name":"Master","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science","school":null,"contributors":[],"advisors":["Oliver, William D."],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-05","date_published":"2024-05","updated_at":"2026-07-22T22:21:11Z","subjects":[],"languages":[],"rights":["In Copyright - Educational Use Permitted","Copyright retained by author(s)"],"rights_urls":["https://rightsstatements.org/page/InC-EDU/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1721.1/156302","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Oliver, William D."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science"]},{"key":"dc:creator","label":"Author","values":["Jha, Shantanu R."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2024-08-21T18:55:10Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-08-21T18:55:10Z"]},{"key":"dc:date.issued","label":"Date","values":["2024-05"]},{"key":"dc:publisher","label":"Institution","values":["Massachusetts Institute of Technology"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master","Master of Science in Electrical Engineering and Computer Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["In Copyright - Educational Use Permitted","Copyright retained by author(s)"]},{"key":"dc:rights.uri","label":"Rights URI","values":["https://rightsstatements.org/page/InC-EDU/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1721.1/156302"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.M."]},{"key":"dc:title","label":"Title","values":["Extensible Platforms for Bosonic Quantum Error Correction"]}]}],"canonical_facts":{"dc:contributor.advisor":["Oliver, William D."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science"],"dc:creator":["Jha, Shantanu R."],"dc:date.accessioned":["2024-08-21T18:55:10Z"],"dc:date.available":["2024-08-21T18:55:10Z"],"dc:date.issued":["2024-05"],"dc:description.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."],"dc:description.degree":["S.M."],"dc:identifier.uri":["https://hdl.handle.net/1721.1/156302"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["In Copyright - Educational Use Permitted","Copyright retained by author(s)"],"dc:rights.uri":["https://rightsstatements.org/page/InC-EDU/1.0/"],"dc:title":["Extensible Platforms for Bosonic Quantum Error Correction"],"dc:type":["Thesis"],"thesis:degree_name":["Master","Master of Science in Electrical Engineering and Computer Science"]},"updated_at":"2026-07-22T22:21:11Z"}