Experimental Realization and Characterization of Stabilized Pair Coherent States

• URL: http://arxiv.org/abs/2209.11643v1
• Date: Fri, 23 Sep 2022 15:24:25 GMT
• Title: Experimental Realization and Characterization of Stabilized Pair Coherent States
• Authors: Jeffrey M. Gertler, Sean van Geldern, Shruti Shirol, Liang Jiang, and Chen Wang
• Abstract summary: PCS is an interesting class of non-Gaussian continuous-variable entangled state. PCS is at the heart of a promising quantum error correction code: the pair cat code. We report an experimental demonstration of the pair coherent state of microwave photons in two superconducting cavities.
• Score: 4.486044407450978
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The pair coherent state (PCS) is a theoretical extension of the Glauber coherent state to two harmonic oscillators. It is an interesting class of non-Gaussian continuous-variable entangled state and is also at the heart of a promising quantum error correction code: the pair cat code. Here we report an experimental demonstration of the pair coherent state of microwave photons in two superconducting cavities. We implement a cross-cavity pair-photon driven dissipation process, which conserves the photon number difference between cavities and stabilizes the state to a specific complex amplitude. We further introduce a technique of quantum subspace tomography, which enables direct measurements of individual coherence elements of a high-dimensional quantum state without global tomographic reconstruction. We characterize our two-mode quantum state with up to 4 photons in each cavity using this subspace tomography together with direct measurements of the photon number difference and the joint Wigner function. We identify the spurious cross-Kerr interaction between the cavities and our dissipative reservoir mode as a prominent dephasing channel that limits the steady-state coherence in our current scheme. Our experiment provides a set of reservoir engineering and state characterization tools to study quantum optics and implement multi-mode bosonic codes in superconducting circuits.

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