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Showing 2017 · quant-phShow all

8 papers · 2 filters

quant-ph2017★ 109 cited

Inversion of Qubit Energy Levels in Qubit-Oscillator Circuits in the Deep-Strong-Coupling Regime

Fumiki Yoshihara, Tomoko Fuse, Ziqiao Ao +6

We report on experimentally measured light shifts of superconducting flux qubits deep-strongly coupled to LC oscillators, where the coupling constants are comparable to the qubit a…

quant-ph2017★ 1 cited

Self-Energy Renormalization for Inhomogeneous Nonequilibrium Systems and Field Expansion via Complete Set of Time-Dependent Wave Functions

Y. Kuwahara, Y. Nakamura, Y. Yamanaka

The renormalization conditions of inhomogeneous systems of a quantum field under an external potential are studied, for both equilibrium and nonequilibrium scenarios and based on T…

quant-ph2017★ 14 cited

Long-lived entanglement of two multilevel atoms in a waveguide

Paolo Facchi, Saverio Pascazio, Francesco V. Pepe +1

We study the presence of nontrivial bound states of two multilevel quantum emitters and the photons propagating in a linear waveguide. We characterize the conditions for the existe…

quant-ph2017★ 25 cited

Synchronizing Quantum Harmonic Oscillators through Two-Level Systems

B. Militello, H. Nakazato, A. Napoli

Two oscillators coupled to a two-level system which in turn is coupled to an infinite number of oscillators (reservoir) are considered, bringing to light the occurrence of synchron…

quant-ph2017★ 21 cited

Time evolution of a pair of distinguishable interacting spins subjected to controllable and noisy magnetic fields

R. Grimaudo, Yu. Belousov, H. Nakazato +1

The quantum dynamics of a -conserving Hamiltonian model describing two coupled spins and $\hat{\m…

quant-ph2017★ 65 cited

Estimating Temperature via Sequential Measurements

Antonella De Pasquale, Kazuya Yuasa, Vittorio Giovannetti

We study the efficiency of estimation procedures where the temperature of an external bath is indirectly recovered by monitoring the transformations induced on a probing system tha…

quant-ph2017★ 13 cited

Remote Parameter Estimation in a Quantum Spin Chain Enhanced by Local Control

Jukka Kiukas, Kazuya Yuasa, Daniel Burgarth

We study the interplay of control and parameter estimation on a quantum spin chain. A single qubit probe is attached to one end of the chain, while we wish to estimate a parameter…

quant-ph2017★ 1 cited

Lindbladian purification

Christian Arenz, Daniel Burgarth, Vittorio Giovannetti +2

In a recent work [D. K. Burgarth et al., Nat. Commun. 5, 5173 (2014)] it was shown that a series of frequent measurements can project the dynamics of a quantum system onto a subspa…