The QFI for sensing coherent field amplitude with an atom is bounded by 4 (approached only in vacuum), reaches 1.47 for large amplitudes at specific times, scales linearly with multi-mode interactions due to back-action, and has a finite optimal rate in the continuous weak-source limit.
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Quantum Mpemba effect in Markovian open quantum systems can be realized via decoherence-free subspaces with decay rates that scale exponentially with system size, plus subtleties revealed by Davies map unravelings.
Zero Fourier modes in circular photonic waveguide networks create a protected subspace that enables perfect state transfer to the diametrically opposite site when the number of sites N equals 4n.
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Quantum sensing of a quantum field
The QFI for sensing coherent field amplitude with an atom is bounded by 4 (approached only in vacuum), reaches 1.47 for large amplitudes at specific times, scales linearly with multi-mode interactions due to back-action, and has a finite optimal rate in the continuous weak-source limit.
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Unraveling the Quantum Mpemba Effect on Markovian Open Quantum Systems
Quantum Mpemba effect in Markovian open quantum systems can be realized via decoherence-free subspaces with decay rates that scale exponentially with system size, plus subtleties revealed by Davies map unravelings.
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Perfect state transfer in quantum photonic networks based on Fourier modes
Zero Fourier modes in circular photonic waveguide networks create a protected subspace that enables perfect state transfer to the diametrically opposite site when the number of sites N equals 4n.