Reaching the true shot-noise-limited phase sensitivity in self-heterodyne interferometry

2022 ◽  
pp. 1-1
Author(s):  
Vincent Michaud-Belleau ◽  
Jean-Daniel Deschenes ◽  
Jerome Genest
Keyword(s):  
Shot Noise ◽  
Phase Sensitivity ◽  
Heterodyne Interferometry

Quantum Fisher information for superpositions of spin states

2010 ◽  
Vol 10 (5&6) ◽  
pp. 498-508
Author(s):  
H.-N. Xiong ◽  
J. Ma ◽  
W.-F. Liu ◽  
X. Wang
Keyword(s):  
Fisher Information ◽  
Shot Noise ◽  
Quantum Fisher Information ◽  
Entanglement Measure ◽  
Spin States ◽  
Phase Sensitivity ◽  
Noise Limit ◽  
Necessary And Sufficient ◽  
Shot Noise Limit ◽  
Dicke States

In terms of quantum Fisher information, a quantity $\chi^{2}$ was introduced by Pezz\'{e} and Smerzi, which is a multiparticle entanglement measure, and provides a necessary and sufficient condition for sub-shot-noise phase estimation sensitivity. We derive a general expression of $\chi ^{2}$ for arbitrary symmetric multiqubit states with nonzero mean spins. It is shown that the entangled symmetric states are useful for phase sensitivity beyond the shot-noise limit. Using the expression, we explicitly examine a series of superpositions of spin states. We find that the superpositions of Dicke states perform better than Dicke states themselves in phase esitmation. Although the spin coherent states themselves only have a shot-noise limit phase sensitivity, their superpositions may reach the Heisenberg limit.

Restoring sub-shot noise phase sensitivity in a realistic two-photon interferometry

2015 ◽  
Author(s):  
Michał Jachura ◽  
Radosław Chrapkiewicz ◽  
Rafał Demkowicz-Dobrzański ◽  
Wojciech Wasilewski ◽  
Konrad Banaszek
Keyword(s):  
Shot Noise ◽  
Phase Sensitivity ◽  
Two Photon

scholarly journals QUANTUM INTERFEROMETRY AT ZERO AND FINITE TEMPERATURE WITH TWO-MODE BOSONIC JOSEPHSON JUNCTIONS

2012 ◽  
Vol 10 (08) ◽  
pp. 1241008
Author(s):  
G. MAZZARELLA
Keyword(s):  
Shot Noise ◽  
Finite Temperature ◽  
Scaling Law ◽  
Phase Sensitivity ◽  
Zero Temperature ◽  
Quantum Interferometry ◽  
Noise Limit ◽  
Sensitivity Indicator ◽  
Shot Noise Limit ◽  
Number Of Particles

We analyze phase interferometry realized with a bosonic Josephson junction (BJJ) made of trapped dilute and ultracold atoms. By using a suitable phase sensitivity indicator we study the zero temperature junction-states useful to achieve sub shot-noise precisions. Sub shot-noise phase shift sensitivities can be reached even at finite temperature under a suitable choice of the junction state. We infer a scaling law in terms of the size system (that is, the number of particles) for the temperature at which the shot-noise limit is not overcome anymore.

Reduction of shot-noise in quantum conductors

1999 ◽  
Vol 09 (PR2) ◽  
pp. Pr2-23
Author(s):  
L. Saminadayar ◽  
A. Kumar ◽  
D. C. Glattli ◽  
Y. Jin ◽  
B. Etienne
Keyword(s):  
Shot Noise

A Note on Shot-Noise and Reliability Modeling,

1984 ◽  
Author(s):  
A. J. Lemoine ◽  
M. L. Wenocur
Keyword(s):  
Shot Noise ◽  
Reliability Modeling
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