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Research Paper#Quantum Computing, Qubits, Spectroscopy🔬 ResearchAnalyzed: Jan 3, 2026 16:42

Spectroscopy of Quantum Phase Slips for Qubit Control

Published:Dec 30, 2025 22:35
1 min read
ArXiv

Analysis

This paper explores the use of spectroscopy to understand and control quantum phase slips in parametrically driven oscillators, which are promising for next-generation qubits. The key is visualizing real-time instantons, which govern phase-slip events and limit qubit coherence. The research suggests a new method for efficient qubit control by analyzing the system's response to AC perturbations.
Reference

“The spectrum of the system's response -- captured by the so-called logarithmic susceptibility (LS) -- enables a direct observation of characteristic features of real-time instantons.”

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Research Paper#Economics, Econometrics, Industrial Organization, Demand Estimation🔬 ResearchAnalyzed: Jan 3, 2026 19:06

Nonparametric Demand Identification Without Exogenous Characteristics

Published:Dec 29, 2025 05:19
1 min read
ArXiv

Analysis

This paper challenges the conventional wisdom that exogenous product characteristics are necessary for identifying differentiated product demand. It proposes a method using 'recentered instruments' that combines price shocks and endogenous characteristics, offering a potentially more flexible approach. The core contribution lies in demonstrating identification under weaker assumptions and introducing the 'faithfulness' condition, which is argued to be a technical, rather than economic, restriction. This could have significant implications for empirical work in industrial organization, allowing researchers to identify demand functions in situations where exogenous characteristic data is unavailable or unreliable.
Reference

“Price counterfactuals are nonparametrically identified by recentered instruments -- which combine exogenous shocks to prices with endogenous product characteristics -- under a weaker index restriction and a new condition we term faithfulness.”

PermalinkArXiv