Ultrafast Superconducting Qubit Readout with the Quarton Coupler

• URL: http://arxiv.org/abs/2402.15664v1
• Date: Sat, 24 Feb 2024 00:39:35 GMT
• Title: Ultrafast Superconducting Qubit Readout with the Quarton Coupler
• Authors: Yufeng Ye, Jeremy B. Kline, Sean Chen, Kevin P. O'Brien
• Abstract summary: State-of-the-art readout is based on a dispersive cross-Kerr coupling between a qubit and its readout resonator. We present a new scheme that uses the quarton coupler to facilitate a large (greater than 250 MHz) cross-Kerr between a transmon qubit and its readout resonator. Full master equation simulations show a 5 ns readout time with greater than 99% readout and QND fidelity.
• Score: 1.4571671739637337
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Fast, high-fidelity, and quantum nondemolition (QND) qubit readout is an essential element of quantum information processing. For superconducting qubits, state-of-the-art readout is based on a dispersive cross-Kerr coupling between a qubit and its readout resonator. The resulting readout can be high-fidelity and QND, but readout times are currently limited to the order of 50 ns due to the dispersive cross-Kerr of magnitude 10 MHz. Here, we present a new readout scheme that uses the quarton coupler to facilitate a large (greater than 250 MHz) cross-Kerr between a transmon qubit and its readout resonator. Full master equation simulations show a 5 ns readout time with greater than 99% readout and QND fidelity. Unlike state-of-the-art dispersive readout, the proposed "quartonic readout" scheme relies on a transmon with linearized transitions as the readout resonator. Such operational points are found from a detailed theoretical treatment and parameter study of the coupled system. The quartonic readout circuit is also experimentally feasible and preserves the coherence properties of the qubit. Our work reveals a new path for order-of-magnitude improvements of superconducting qubit readout by engineering nonlinear light-matter couplings in parameter regimes unreachable by existing designs.

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