References & Citations
Quantum Physics
Title: Driven Multiphoton Qubit-Resonator Interactions
(Submitted on 2 May 2024 (v1), last revised 17 May 2024 (this version, v2))
Abstract: We develop a general theory for multiphoton qubit-resonator interactions enhanced by a qubit drive. The interactions generate qubit-conditional operations in the resonator when the driving is near $n$-photon cross-resonance, namely, the qubit drive is $n$-times the resonator frequency. We pay special attention to the strong driving regime, where the interactions are conditioned on the qubit dressed states. We consider the specific case where $n=2$, which results in qubit-conditional squeezing (QCS). We propose to use the QCS protocol for amplifying resonator displacements and their superpositions. We find the QCS protocol to generate a superposition of orthogonally squeezed states following a properly chosen qubit measurement. We outline quantum information processing applications for these states, including encoding a qubit in a resonator and performing a quantum non-demolition measurement of the qubit inferred from the resonator's second statistical moment. Next, we employ a two-tone drive to engineer an effective $n$-photon Rabi Hamiltonian in any desired coupling regime. In other words, the effective coupling strengths can be tuned over a wide range, thus allowing for the realization of new regimes that have so far been inaccessible. Finally, we propose a multiphoton circuit QED implementation based on a transmon qubit coupled to a resonator via an asymmetric SQUID. We provide realistic parameter estimates for the two-photon operation regime that can host the aforementioned two-photon protocols. We use numerical simulations to show that even in the presence of spurious terms and decoherence, our analytical predictions are robust.
Submission history
From: Mohammad Ayyash [view email][v1] Thu, 2 May 2024 17:48:46 GMT (936kb,D)
[v2] Fri, 17 May 2024 00:07:36 GMT (865kb,D)
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