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21 papers · 2 filters
Spin qudit tomography and state reconstruction error
Michael A. Perlin, Diego Barberena, Ana Maria Rey
We consider the task of performing quantum state tomography on a -level spin qudit, using only measurements of spin projection onto different quantization axes. After introducin…
A cavity-QED quantum simulator of dynamical phases of a BCS superconductor
Robert J. Lewis-Swan, Diego Barberena, Julia R. K. Cline +3
We propose to simulate dynamical phases of a BCS superconductor using an ensemble of cold atoms trapped in an optical cavity. Effective Cooper pairs are encoded via internal states…
Atom-light entanglement for precise field sensing in the optical domain
Diego Barberena, Robert J. Lewis-Swan, Ana Maria Rey +1
Macroscopic arrays of cold atoms trapped in optical cavities can reach the strong atom-light collective coupling regime thanks to the simultaneous interactions of the cavity mode w…
Variational Quantum Algorithm for Estimating the Quantum Fisher Information
Jacob L. Beckey, M. Cerezo, Akira Sone +1
The Quantum Fisher information (QFI) quantifies the ultimate precision of estimating a parameter from a quantum state, and can be regarded as a reliability measure of a quantum sys…
Generalized Measure of Quantum Fisher Information
Akira Sone, M. Cerezo, Jacob L. Beckey +1
In this work, we present a lower bound on the quantum Fisher information (QFI) which is efficiently computable on near-term quantum devices. This bound itself is of interest, as we…
Optimal two-photon excitation of bound states in non-Markovian waveguide QED
Rahul Trivedi, Daniel Malz, Shanhui Fan +1
Bound states arise in waveguide QED systems with a strong frequency-dependence of the coupling between emitters and photonic modes. While exciting such bound-states with single pho…