2026-09-20T00:14:55Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1565562024-09-04T03:37:02Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
OβBrien, Kevin P.
Ye, Yufeng
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2024-09-03T21:07:14Z
2024-09-03T21:07:14Z
2024-05
2024-07-10T13:02:24.766Z
https://hdl.handle.net/1721.1/156556
The interaction between an atom and an electromagnetic mode of a resonator is of both fundamental interest and is ubiquitous in quantum technologies. Most prior work studies a linear light-matter coupling of the form [formula], where π measured relative to photonic (πβ) and atomic (π subscript π) mode frequencies can reach the ultrastrong regime [formula]. In contrast, a nonlinear light-matter coupling of the form [formula] has the advantage of commuting with the atomic [formula] and photonic Γ’ superscript β π Hamiltonian, allowing for fundamental operations such as quantum-non-demolition (QND) measurement. However, due to the perturbative nature of nonlinear coupling, the state-of-the-art π/max(ππ, ππ) is limited to < 10β»Β². In this thesis, we develop the theory of quarton couplers and experimentally demonstrate, for the first time, a near-ultrastrong π/max(πβ, π subscript π) = (4.852 Β± 0.006) Γ 10β»Β² nonlinear coupling of a superconducting artificial atom and a nearly-linear resonator. We also show signatures of light-light nonlinear coupling [formula], and π/2π = 580.3 Β± 0.4 MHz matter-matter nonlinear coupling [formula] which represents the largest reported ππ interaction between two coherent qubits. Finally, we present a new qubit readout scheme that uses the quarton coupler to enable simulated performance of 5 ns readout time with greater than 99% readout and QND fidelity. Our work reveals a new path for order-of-magnitude improvements of fundamental superconducting qubit operations by engineering nonlinear light-matter couplings in parameter regimes unreachable by existing designs.
Ph.D.
Massachusetts Institute of Technology
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The Quarton Coupler for Near-Ultrastrong Nonlinear Light-Matter Coupling in Superconducting Circuits
Thesis
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Doctoral
Doctor of Philosophy
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<Abstract>The interaction between an atom and an electromagnetic mode of a resonator is of both fundamental interest and is ubiquitous in quantum technologies. Most prior work studies a linear light-matter coupling of the form [formula], where π measured relative to photonic (πβ) and atomic (π subscript π) mode frequencies can reach the ultrastrong regime [formula]. In contrast, a nonlinear light-matter coupling of the form [formula] has the advantage of commuting with the atomic [formula] and photonic Γ’ superscript β π Hamiltonian, allowing for fundamental operations such as quantum-non-demolition (QND) measurement. However, due to the perturbative nature of nonlinear coupling, the state-of-the-art π/max(ππ, ππ) is limited to < 10β»Β². In this thesis, we develop the theory of quarton couplers and experimentally demonstrate, for the first time, a near-ultrastrong π/max(πβ, π subscript π) = (4.852 Β± 0.006) Γ 10β»Β² nonlinear coupling of a superconducting artificial atom and a nearly-linear resonator. We also show signatures of light-light nonlinear coupling [formula], and π/2π = 580.3 Β± 0.4 MHz matter-matter nonlinear coupling [formula] which represents the largest reported ππ interaction between two coherent qubits. Finally, we present a new qubit readout scheme that uses the quarton coupler to enable simulated performance of 5 ns readout time with greater than 99% readout and QND fidelity. Our work reveals a new path for order-of-magnitude improvements of fundamental superconducting qubit operations by engineering nonlinear light-matter couplings in parameter regimes unreachable by existing designs.</Abstract>
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