842 citations · 1.3k across the 10 of their papers we have counts for
10 papers
Differential magnetometry with partially flipped Dicke states
Iagoba Apellaniz, Manuel Gessner, Géza Tóth
We study magnetometry of gradients and homogeneous background fields along the three orthogonal directions using two spatially separated spin ensembles. We derive trade-off relatio…
Number-phase uncertainty relations and bipartite entanglement detection in spin ensembles
Giuseppe Vitagliano, Matteo Fadel, Iagoba Apellaniz +4
We present a method to detect bipartite entanglement based on number-phase-like uncertainty relations in split spin ensembles. First, we derive an uncertainty relation that plays t…
Entanglement between two spatially separated atomic modes
Karsten Lange, Jan Peise, Bernd Lücke +6
Modern quantum technologies in the fields of quantum computing, quantum simulation and quantum metrology require the creation and control of large ensembles of entangled particles.…
Lower Bounds on Quantum Metrological Precision
Iagoba Apellaniz
In this thesis, first, we investigate the metrological usefulness of a family of states known as unpolarized Dicke states, which turn to be very sensitive to the magnetic field. Qu…
Precision bounds for gradient magnetometry with atomic ensembles
Iagoba Apellaniz, Inigo Urizar-Lanz, Zoltan Zimboras +2
We study gradient magnetometry with an ensemble of atoms with arbitrary spin. We calculate precision bounds for estimating the gradient of the magnetic field based on the quantum F…
Entanglement and extreme spin squeezing of unpolarized states
Giuseppe Vitagliano, Iagoba Apellaniz, Matthias Kleinmann +3
We present criteria to detect the depth of entanglement in macroscopic ensembles of spin-j particles using the variance and second moments of the collective spin components. The cl…
Optimal witnessing of the quantum Fisher information with few measurements
Iagoba Apellaniz, Matthias Kleinmann, Otfried Gühne +1
We show how to verify the metrological usefulness of quantum states based on the expectation values of an arbitrarily chosen set of observables. In particular, we estimate the quan…
Detecting metrologically useful entanglement in the vicinity of Dicke states
Iagoba Apellaniz, Bernd Lücke, Jan Peise +2
We present a method to verify the metrological usefulness of noisy Dicke states of a particle ensemble with only a few collective measurements, without the need for a direct measur…
Quantum metrology from a quantum information science perspective
Geza Toth, Iagoba Apellaniz
We summarise important recent advances in quantum metrology, in connection to experiments in cold gases, trapped cold atoms and photons. First we review simple metrological setups,…
Spin squeezing and entanglement for arbitrary spin
Giuseppe Vitagliano, Iagoba Apellaniz, Inigo L. Egusquiza +1
A complete set of generalized spin-squeezing inequalities is derived for an ensemble of particles with an arbitrary spin. Our conditions are formulated with the first and second mo…