Fast Sideband Control of a Weakly Coupled Multimode Bosonic Memory

• URL: http://arxiv.org/abs/2503.10623v1
• Date: Thu, 13 Mar 2025 17:59:07 GMT
• Title: Fast Sideband Control of a Weakly Coupled Multimode Bosonic Memory
• Authors: Jordan Huang, Thomas J. DiNapoli, Gavin Rockwood, Ming Yuan, Prathyankara Narasimhan, Eesh Gupta, Mustafa Bal, Francesco Crisa, Sabrina Garattoni, Yao Lu, Liang Jiang, Srivatsan Chakram,
• Abstract summary: Circuit quantum electrodynamics with superconducting cavities and nonlinear circuits like transmons offers a promising platform for hardware-efficient quantum information processing.<n>We address critical challenges in realizing this architecture by weakening the dispersive coupling.<n>We demonstrate fast, high-fidelity multimode control by dynamically amplifying gate speeds through transmon-mediated sideband interactions.
• Score: 8.767643277178196
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Circuit quantum electrodynamics (cQED) with superconducting cavities coupled to nonlinear circuits like transmons offers a promising platform for hardware-efficient quantum information processing. We address critical challenges in realizing this architecture by weakening the dispersive coupling while also demonstrating fast, high-fidelity multimode control by dynamically amplifying gate speeds through transmon-mediated sideband interactions. This approach enables transmon-cavity SWAP gates, for which we achieve speeds up to 30 times larger than the bare dispersive coupling. Combined with transmon rotations, this allows for efficient, universal state preparation in a single cavity mode, though achieving unitary gates and extending control to multiple modes remains a challenge. In this work, we overcome this by introducing two sideband control strategies: (1) a shelving technique that prevents unwanted transitions by temporarily storing populations in sideband-transparent transmon states and (2) a method that exploits the dispersive shift to synchronize sideband transition rates across chosen photon-number pairs to implement transmon-cavity SWAP gates that are selective on photon number. We leverage these protocols to prepare Fock and binomial code states across any of ten modes of a multimode cavity with millisecond cavity coherence times. We demonstrate the encoding of a qubit from a transmon into arbitrary vacuum and Fock state superpositions, as well as entangled NOON states of cavity mode pairs\textemdash a scheme extendable to arbitrary multimode Fock encodings. Furthermore, we implement a new binomial encoding gate that converts arbitrary transmon superpositions into binomial code states in $\qty{4}{\micro\second}$ (less than $1/\chi$), achieving an average post-selected final state fidelity of $\qty{96.3}{\percent}$ across different fiducial input states.

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