Quantum Metrology in the Ultrastrong Coupling Regime of Light-Matter Interactions: Leveraging Virtual Excitations without Extracting Them
arXiv:2501.16304 · doi:10.1103/cxvs-5pb1
Abstract
Virtual excitations, inherent to ultrastrongly coupled light-matter systems, induce measurable modifications in system properties, offering a novel resource for quantum technologies. In this work, we demonstrate how these virtual excitations and their correlations can be harnessed to enhance precision measurements, without the need to extract them. Building on the paradigmatic Dicke model, which describes the interaction between an ensemble of two-level atoms and a single radiation mode, we propose a method to harness hybridized light-matter modes whose renormalized frequencies encode the effects of virtual excitations for quantum metrology. Remarkably, we find that for a fixed squeezing parameter , exploiting virtual squeezing through oscillator frequency shifts yields a quadratic enhancement in estimation precision -- scaling as -- compared to the conventional scaling of real squeezed states. These results show that virtual excitations, though unobservable, can drive metrological performance beyond the standard quantum limit. Our approach establishes a broadly applicable framework for high-precision measurements across a wide class of ultrastrongly coupled quantum systems.
References in corpus (27)
- Microwave photonics with superconducting quantum circuits
- Cold atoms in cavity-generated dynamical optical potentials
- Quantum technologies with hybrid systems
- Quantum critical scaling of the geometric tensors
- Ultra-Strong Light-Matter Coupling Regime with Polariton Dots
- Dynamical phase transition in the open Dicke model
- Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics
- Roton-type mode softening in a quantum gas with cavity-mediated long-range interactions
- Input-output theory of cavities in the ultra-strong coupling regime: the case of a time-independent vacuum Rabi frequency
- Quantum-enhanced sensing of displacements and electric fields with large trapped-ion crystals
- Observation of a quantum phase transition in the quantum Rabi model with a single trapped ion
- Quantum metrology in Lipkin-Meshkov-Glick critical systems
- Some remarks on 'superradiant' phase transitions in light-matter systems
- Quantum amplification and simulation of strong and ultrastrong coupling of light and matter
- Combining critical and quantum metrology
- Mechanical squeezing via unstable dynamics in a microcavity
- Critical quantum metrology assisted by real-time feedback control
- Adiabatic critical quantum metrology cannot reach the Heisenberg limit even when shortcuts to adiabaticity are applied
- Detecting virtual photons in ultrastrongly coupled superconducting quantum circuits
- Dissipation and detection of polaritons in ultrastrong coupling regime
- Inverted harmonic oscillator dynamics of the nonequilibrium phase transition in the Dicke model
- Squeezing and overcoming the Heisenberg scaling with spin-orbit coupled quantum gases
- Unique Steady-State Squeezing in a Driven Quantum Rabi Model
- Dissipative phase transitions in optomechanical systems
- Uncertain Quantum Critical Metrology: From Single to Multi Parameter Sensing
- Interplay between time and energy in bosonic noisy quantum metrology
- Linear Ultrastrong Optomechanical Interaction