scholarly journals Versatile Super-Sensitive Metrology Using Induced Coherence

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 458
Author(s):  
Nathaniel R. Miller ◽  
Sven Ramelow ◽  
William N. Plick
Keyword(s):  
Bright Light ◽  
Phase Estimation ◽  
Practical Advantage ◽  
Intensity Measurements ◽  
Frequency Domains ◽  
Parametric Down Conversion ◽  
Potential Applications ◽  
Noise Limit ◽  
Down Conversion ◽  
Shot Noise Limit

We theoretically analyze the phase sensitivity of the Induced-Coherence (Mandel-Type) Interferometer, including the case where the sensitivity is "boosted" into the bright input regime with coherent-light seeding. We find scaling which reaches below the shot noise limit, even when seeding the spatial mode which does not interact with the sample – or when seeding the undetected mode. It is a hybrid of a linear and a non-linear (Yurke-Type) interferometer, and aside from the supersensitivity, is distinguished from other systems by "preferring" an imbalance in the gains of the two non-linearities (with the second gain being optimal at low values), and non-monotonic behavior of the sensitivity as a function of the gain of the second non-linearity. Furthermore, the setup allows use of subtracted intensity measurements, instead of direct (additive) or homodyne measurements – a significant practical advantage. Bright, super-sensitive phase estimation of an object with different light fields for interaction and detection is possible, with various potential applications, especially in cases where the sample may be sensitive to light, or is most interesting in frequency domains outside what is easily detected, or when desiring bright-light phase estimation with sensitive/delicate detectors. We use an analysis in terms of general squeezing and discover that super-sensitivity occurs only in this case – that is, the effect is not present with the spontaneous-parametric-down-conversion approximation, which many previous analyses and experiments have focused on.

scholarly journals Heisenberg-limited single-mode quantum metrology in a superconducting circuit

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
W. Wang ◽  
Y. Wu ◽  
Y. Ma ◽  
W. Cai ◽  
L. Hu ◽  
...  
Keyword(s):  
Single Mode ◽  
Coherence Time ◽  
Microwave Cavity ◽  
Phase Estimation ◽  
Quantum Metrology ◽  
Practical Applications ◽  
Infinite Dimensional ◽  
Noise Limit ◽  
Quantum Error ◽  
Shot Noise Limit

Abstract Two-mode interferometers lay the foundations for quantum metrology. Instead of exploring quantum entanglement in the two-mode interferometers, a single bosonic mode also promises a measurement precision beyond the shot-noise limit (SNL) by taking advantage of the infinite-dimensional Hilbert space of Fock states. Here, we demonstrate a single-mode phase estimation that approaches the Heisenberg limit (HL) unconditionally. Due to the strong dispersive nonlinearity and long coherence time of a microwave cavity, quantum states of the form $$\left( {\left| 0 \right\rangle + \left| N \right\rangle } \right)/\sqrt 2$$ 0 + N ∕ 2 can be generated, manipulated and detected with high fidelities, leading to an experimental phase estimation precision scaling as ∼N−0.94. A 9.1 dB enhancement of the precision over the SNL at N = 12 is achieved, which is only 1.7 dB away from the HL. Our experimental architecture is hardware efficient and can be combined with quantum error correction techniques to fight against decoherence, and thus promises quantum-enhanced sensing in practical applications.

scholarly journals Monitoring the quantum-classical transition in thermally seeded parametric down-conversion by intensity measurements

2009 ◽  
Vol 79 (6) ◽  
Author(s):  
I. P. Degiovanni ◽  
M. Genovese ◽  
V. Schettini ◽  
M. Bondani ◽  
A. Andreoni ◽  
...  
Keyword(s):  
Intensity Measurements ◽  
Parametric Down Conversion ◽  
Classical Transition ◽  
Down Conversion

scholarly journals High-NOON States with High Flux of Photons Using Coherent Beam Stimulated Noncollinear Parametric Down Conversion

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Aziz Kolkiran
Keyword(s):  
Count Rate ◽  
Amplitude Ratio ◽  
Bright Light ◽  
Super Resolution ◽  
Coherent Beam ◽  
Light Sources ◽  
Coherent Light ◽  
High Count ◽  
Parametric Down Conversion ◽  
Down Conversion

We show how to reach high fidelity NOON states with a high count rate inside optical interferometers. Previously, it has been shown that by mixing squeezed and coherent light at a beam splitter, it is possible to generate NOON states of arbitrary N with a fidelity as high as 94%. The scheme is based on higher-order interference between “quantum” down-converted light and “classical” coherent light. However, this requires optimizing the amplitude ratio of classical to quantum light, thereby limiting the overall count rate for the interferometric super-resolution signal. We propose using coherent beam stimulated noncollinear two-mode down-converted light as input to the interferometer. Our scheme is based on the stimulation of noncollinear parametric down conversion by coherent light sources. We get a better flexibility of choosing the amplitude ratio in generating NOON states. This enables super-resolution intensity exceeding the previous scheme by many orders of magnitude. Therefore, we hope to improve the magnitude of N-fold super-resolution in quantum interferometry for arbitrary N using bright light sources. We give improved results for N = 4 and 5.

Ab initio phase estimation at the shot noise limit with on–off measurement

2019 ◽  
Vol 18 (11) ◽  
Author(s):  
Kaimin Zheng ◽  
Huichao Xu ◽  
Aonan Zhang ◽  
Xinghai Ning ◽  
Lijian Zhang
Keyword(s):  
Ab Initio ◽  
Shot Noise ◽  
Phase Estimation ◽  
Noise Limit ◽  
Shot Noise Limit

Generation of Optical—Terahertz Biphotons and Detection of Their Terahertz Component under Frequency-Nondegenerate Parametric Down-Conversion

JETP Letters ◽  
2020 ◽  
Vol 112 (5) ◽  
pp. 269-273
Author(s):  
V. D. Sultanov ◽  
K. A. Kuznetsov ◽  
A. A. Leontyev ◽  
G. Kh. Kitaeva
Keyword(s):  
Parametric Down Conversion ◽  
Down Conversion

scholarly journals Surpassing the shot-noise limit by homodyne-mediated feedback

2016 ◽  
Vol 41 (17) ◽  
pp. 3932 ◽  
Author(s):  
Guofeng Zhang ◽  
Hanjie Zhu
Keyword(s):  
Shot Noise ◽  
Noise Limit ◽  
Shot Noise Limit

scholarly journals Overcoming detection loss and noise in squeezing-based optical sensing

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Gaetano Frascella ◽  
Sascha Agne ◽  
Farid Ya. Khalili ◽  
Maria V. Chekhova
Keyword(s):  
Shot Noise ◽  
Optical Sensing ◽  
Detection Efficiency ◽  
Signal To Noise Ratio ◽  
Real Life ◽  
Squeezed States ◽  
Squeezed Light ◽  
Noise Limit ◽  
Imaging And Spectroscopy ◽  
Shot Noise Limit

AbstractAmong the known resources of quantum metrology, one of the most practical and efficient is squeezing. Squeezed states of atoms and light improve the sensing of the phase, magnetic field, polarization, mechanical displacement. They promise to considerably increase signal-to-noise ratio in imaging and spectroscopy, and are already used in real-life gravitational-wave detectors. But despite being more robust than other states, they are still very fragile, which narrows the scope of their application. In particular, squeezed states are useless in measurements where the detection is inefficient or the noise is high. Here, we experimentally demonstrate a remedy against loss and noise: strong noiseless amplification before detection. This way, we achieve loss-tolerant operation of an interferometer fed with squeezed and coherent light. With only 50% detection efficiency and with noise exceeding the level of squeezed light more than 50 times, we overcome the shot-noise limit by 6 dB. Sub-shot-noise phase sensitivity survives up to 87% loss. Application of this technique to other types of optical sensing and imaging promises a full use of quantum resources in these fields.

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