Effect of phase noise on quantum correlations in Bose-Josephson junctions
G. Ferrini, D. Spehner, A. Minguzzi, F. W. J. Hekking
DOI 10.1103/PhysRevA.84.043628 · Physical Review A
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
In a two-mode Bose-Josephson junction the dynamics induced by a sudden quench of the tunnel amplitude leads to the periodic formation of entangled states. For instance, squeezed states are formed at short times and macroscopic superpositions of phase states at later times. In atom interferometry, the two modes of the junction play the role of the two arms of a Mach-Zehnder interferometer; use of multiparticle entangled states allows the enhancement of phase sensitivity with respect to that obtained from uncorrelated atoms. Decoherence due to the presence of noise degrades quantum correlations between atoms, thus reducing phase sensitivity. We consider decoherence due to stochastic fluctuations of the energies of the two modes of the junction. We analyze its effect on squeezed states and macroscopic superpositions and calculate the squeezing parameter and the quantum Fisher information during the quenched dynamics. The latter quantity measures the amount of quantum correlations useful in interferometry. For moderate noise intensities, we show that it increases on time scales beyond the squeezing regime. This suggests multicomponent superpositions of phase states as interesting candidates for high-precision atom interferometry.
Similar papers
Noise in Bose Josephson junctions: Decoherence and phase relaxation
similarity 0.94G. Ferrini et al.
Source status unknown — claims are unverified
Robust sub-shot-noise measurement via Rabi-Josephson oscillations in bimodal Bose-Einstein condensates
similarity 0.91I. Tikhonenkov et al.
Source status unknown — claims are unverified
Decoherence and entanglement in a bosonic Josephson junction: Bose-enhanced quantum Zeno control of phase diffusion
similarity 0.90Y. Khodorkovsky et al.
Source status unknown — claims are unverified
Squeezing Oscillations in a Multimode Bosonic Josephson Junction
similarity 0.89Tiantian Zhang et al.
Source status unknown — claims are unverified
Number squeezing, quantum fluctuations, and oscillations in mesoscopic Bose Josephson junctions
similarity 0.89G. Ferrini et al.
Source status unknown — claims are unverified
Spectroscopic resonance broadening in a Josephson junction qubit due to current noise
similarity 0.88H. Xu et al.
Source status unknown — claims are unverified