Quantum Fisher Information of Driven-Dissipative Systems from Keldysh Path Integrals

arXiv:2609.26462 · quant-ph, cond-mat.quant-gas, cond-mat.stat-mech · Submitted 2026-09-22 · Read on arXiv

quant-ph, cond-mat.quant-gas, cond-mat.stat-mech

Submitted: 2026-09-22

Updated: 2026-10-09

Code: https://github.com/AG-Lesanovsky/2026-QFIwith-nonequilibrium-field-theory

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Fisher Information — 12× in this paper · explained in 3 episodes
• Wigner function — 7× in this paper · explained in 2 episodes
• Benchmark — 6× in this paper · explained in 2 episodes
• Trace — 6× in this paper · explained in 2 episodes
• Supplemental Material — 5× in this paper
• Lindblad master equation — 4× in this paper · explained in 2 episodes
• Quantum Fisher Information (QFI) — 4× in this paper · explained in 13 episodes
• Symmetry Breaking — 3× in this paper · explained in 3 episodes
• Fidelity — 2× in this paper · explained in 2 episodes
• Hilbert Space — 2× in this paper · explained in 2 episodes
• Phase Transitions — 2× in this paper · explained in 2 episodes
• Truncated Wigner Approximation (TWA) — 2× in this paper · explained in 2 episodes
• Accuracy — 1× in this paper · explained in 1 episode
• Heisenberg Scaling — 1× in this paper · explained in 4 episodes
• Non-Markovian Dynamics — 1× in this paper · explained in 5 episodes
• Superradiance — 1× in this paper · explained in 3 episodes

Sources

• Attaining Quantum Sensing Enhancement from Monitored Dissipative Time Crystals
• Collectively enhanced Ramsey readout by cavity sub- to superradiant transition
• Near-Ultimate Quantum-Enhanced Sensitivity in Dissipative Critical Sensing with Partial Access
• Truncated Wigner approximation for spins in continuous phase space
• Path integral approach to the truncated Wigner approximation of driven-dissipative spins
• Path Integral Approach to Quantum Fisher Information
• Many-Body Super- and Subradiance in Ordered Atomic Arrays
• Quantum to classical relaxation dynamics of the dissipative Rydberg gas

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