Does relativistic motion always degrade quantum Fisher information?

  title={Does relativistic motion always degrade quantum Fisher information?},
  author={Xiaobao Liu and Jiliang Jing and Zehua Tian and Weiping Yao},
  journal={Physical Review D},
We investigate the ultimate estimation precision, characterized by the quantum Fisher information, of a two-level atom as a detector which is coupled to massless scalar field in the Minkowski vacuum. It has been shown that for an inertial detector moving with a constant velocity, its quantum Fisher information is completely unaffected by the velocity, however, it still decays over time due to the decoherence caused by the interaction between the atom and the field. In addition, for a uniformly… 
2 Citations

Figures from this paper

Quantum coherence of a circularly accelerated atom in a spacetime with a reflecting boundary
We investigate, in the paradigm of open quantum systems, the dynamics of quantum coherence of a circularly accelerated atom coupled to a bath of vacuum fluctuating massless scalar field in a
Probing cosmic string spacetime through parameter estimation
Quantum metrology studies the ultimate precision limit of physical quantities by using quantum strategy. In this paper we apply the quantum metrology technologies to the relativistic framework for


Quantum estimation of acceleration and temperature in open quantum system
In an open quantum system, we study the evolution of a two-level atom as a detector which interacts with given environments. For a uniformly accelerated two-level atom coupled to a massless scalar
Fisher information as a probe of spacetime structure: Relativistic quantum metrology in (A)dS.
Relativistic quantum metrology studies the maximal achievable precision for estimating a physical quantity when both quantum and relativistic effects are taken into account. We study the relativistic
Relativistic Quantum Metrology in Open System Dynamics
This work investigates the evolution of a two-level atom as a detector which interacts with a massless scalar field using the master equation approach for open quantum system and finds the optimal precision of estimation is achieved when the detector evolves for a long enough time.
Quantum Fisher information in noninertial frames
We investigate the performance of quantum fisher information under the Unruh-Hawking effect, where one of the observers (eg, Rob) is uniformly accelerated with respect to other partners. In the
Parameter estimation in cosmic string spacetime by using the inertial and accelerated detectors
Since cosmic string spacetime is locally flat but with nontrivial global topology characterized by a deficit angle, we devote to address the quantum bound to the estimation of the deficit angle
Dynamical behavior and geometric phase for a circularly accelerated two-level atom
We study, in the framework of open quantum systems, the time evolution of a circularly accelerated two-level atom coupled in the multipolar scheme to a bath of fluctuating vacuum electromagnetic
Fisher information in a quantum-critical environment
We consider a process of parameter estimation in a spin-j system surrounded by a quantum-critical spin chain. Quantum Fisher information lies at the heart of the estimation task. We employ Ising spin
Fisher information and multiparticle entanglement
Bounds on F imply that genuine multiparticle entanglement is needed for reaching the highest sensitivities in quantum interferometry, and these criteria detect different sets of states and illustrate their strengths by considering several examples.
Electromagnetic shielding in quantum metrology
The dynamics of the quantum Fisher information of the parameters of the initial atomic state and atomic transition frequency is studied, in the framework of open quantum systems, for a static