Inducing macroscopic cat states of nonequilibrium electrons via cat-state light irradiation and projective measurements

• URL: http://arxiv.org/abs/2508.11769v1
• Date: Fri, 15 Aug 2025 18:37:49 GMT
• Title: Inducing macroscopic cat states of nonequilibrium electrons via cat-state light irradiation and projective measurements
• Authors: Shohei Imai,
• Abstract summary: We show that projective measurements on quantum light can induce macroscopic cat states in many-electron systems driven by large-amplitude cat-state light.<n>Our results highlight the need for precise quantum measurement techniques for light to control macroscopic quantum states of matter driven by quantum light.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We show that projective measurements on quantum light can induce macroscopic cat states in many-electron systems driven by large-amplitude cat-state light. Here we investigate the quantum dynamics of N independent two-level electrons interacting with Schr\"odinger cat or kitten states of light. Without measurement, a macroscopic cat state of electrons appears only in an ultrashort time window. In contrast, we demonstrate that photon-number parity or quadrature projective measurements can restore a macroscopic cat state in nonequilibrium electrons, even in the thermodynamic limit. These dynamics are captured by an external-field approximation, in which the electronic system evolves into a Rabi-oscillation cat state. Our results highlight the need for precise quantum measurement techniques for light to control macroscopic quantum states of matter driven by quantum light.

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