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

Phase sensitivity in two-photon optical bistability

1991 ◽  
Vol 43 (9) ◽  
pp. 4979-4986
Author(s):  
Songen Sun ◽  
D. L. Lin ◽  
Zhining Chen
Keyword(s):  
Optical Bistability ◽  
Phase Sensitivity ◽  
Two Photon

scholarly journals Highly sensitive spectral interferometric four-wave mixing microscopy near the shot noise limit and its combination with two-photon excited fluorescence microscopy

2006 ◽  
Vol 14 (23) ◽  
pp. 11204 ◽  
Author(s):  
Keisuke Isobe ◽  
Yasuyuki Ozeki ◽  
Takehito Kawasumi ◽  
Shogo Kataoka ◽  
Shin'ichiro Kajiyama ◽  
...  
Keyword(s):  
Fluorescence Microscopy ◽  
Shot Noise ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Two Photon ◽  
Highly Sensitive ◽  
Noise Limit ◽  
Shot Noise Limit

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.

scholarly journals Spectrally multimode integrated SU(1,1) interferometer

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 461
Author(s):  
Alessandro Ferreri ◽  
Matteo Santandrea ◽  
Michael Stefszky ◽  
Kai H. Luo ◽  
Harald Herrmann ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Single Mode ◽  
Potassium Titanyl Phosphate ◽  
Destructive Interference ◽  
Phase Sensitivity ◽  
Polarization Converter ◽  
Two Photon ◽  
Integrated Architecture ◽  
On Chip ◽  
Detection Strategies

Nonlinear SU(1,1) interferometers are fruitful and promising tools for spectral engineering and precise measurements with phase sensitivity below the classical bound. Such interferometers have been successfully realized in bulk and fiber-based configurations. However, rapidly developing integrated technologies provide higher efficiencies, smaller footprints, and pave the way to quantum-enhanced on-chip interferometry. In this work, we theoretically realised an integrated architecture of the multimode SU(1,1) interferometer which can be applied to various integrated platforms. The presented interferometer includes a polarization converter between two photon sources and utilizes a continuous-wave (CW) pump. Based on the potassium titanyl phosphate (KTP) platform, we show that this configuration results in almost perfect destructive interference at the output and supersensitivity regions below the classical limit. In addition, we discuss the fundamental difference between single-mode and highly multimode SU(1,1) interferometers in the properties of phase sensitivity and its limits. Finally, we explore how to improve the phase sensitivity by filtering the output radiation and using different seeding states in different modes with various detection strategies.

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.

Quantum metrology with two-photon phase-sensitivity and single-photon detection

2017 ◽  
Author(s):  
Panagiotis Vergyris ◽  
Florian Kaiser ◽  
Nicola Montaut ◽  
Olivier Alibart ◽  
Harald Herrmann ◽  
...  
Keyword(s):  
Single Photon ◽  
Phase Sensitivity ◽  
Single Photon Detection ◽  
Quantum Metrology ◽  
Photon Detection ◽  
Two Photon

scholarly journals High-Speed Low-Light In Vivo Two-Photon Voltage Imaging of Large Neuronal Populations

2021 ◽  
Author(s):  
Jelena Platisa ◽  
Xin Ye ◽  
Allison M Ahrens ◽  
Chang Liu ◽  
Ichun A Chen ◽  
...  
Keyword(s):  
Shot Noise ◽  
High Speed ◽  
Neural Circuit ◽  
Frame Rate ◽  
Tissue Imaging ◽  
Photon Flux ◽  
Voltage Imaging ◽  
Neuronal Populations ◽  
Two Photon

Monitoring spiking activity across large neuronal populations at behaviorally relevant timescales is critical for understanding neural circuit function. Unlike calcium imaging, voltage imaging requires kilohertz sampling rates which reduces fluorescence detection to near shot noise levels. High-photon flux excitation can overcome photon-limited shot noise but photo-bleaching and photo-damage restricts the number and duration of simultaneously imaged neurons. We investigated an alternative approach aimed at low two-photon flux, voltage imaging below the shot noise limit. This framework involved developing: a positive-going voltage indicator with improved spike detection (SpikeyGi); an ultra-fast two-photon microscope for kilohertz frame-rate imaging across a 0.4x0.4mm2 field of view, and; a self-supervised denoising algorithm (DeepVID) for inferring fluorescence from shot-noise limited signals. Through these combined advances, we achieved simultaneous high-speed, deep-tissue imaging of more than one hundred densely-labeled neurons over one hour in awake behaving mice. This demonstrates a scalable approach for voltage imaging across increasing neuronal populations.

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