Results 51 to 60 of about 1,418,125 (307)

Quantum Fisher information measurement and verification of the quantum Cramér–Rao bound in a solid-state qubit

npj Quantum Information, 2022
The quantum Cramér–Rao bound sets a fundamental limit on the accuracy of unbiased parameter estimation in quantum systems, relating the uncertainty in determining a parameter to the inverse of the quantum Fisher information. We experimentally demonstrate
Min Yu, Yu Liu, Pengcheng Yang, Musang Gong, Qingyun Cao, Shaoliang Zhang, Haibin Liu, Markus Heyl, Tomoki Ozawa, Nathan Goldman, Jianming Cai   +10 more
doaj   +1 more source

Quantum Metrology for Non-Markovian Processes. [PDF]

Physical Review Letters, 2021
Quantum metrology is a rapidly developing branch of quantum technologies. While various theories have been established on quantum metrology for Markovian processes, i.e., quantum channel estimation, quantum metrology for non-Markovian processes is much ...
A. Altherr, Yuxiang Yang
semanticscholar   +1 more source

Entanglement-enhanced quantum metrology: From standard quantum limit to Heisenberg limit [PDF]

Applied Physics Reviews
Entanglement-enhanced quantum metrology explores the utilization of quantum entanglement to enhance measurement precision. When particles in a probe are prepared into a suitable quantum entangled state, they may collectively accumulate information about ...
Jiahao Huang, Zhuang Min, Chaohong Lee
semanticscholar   +1 more source

Critical quantum metrology with fully-connected models: from Heisenberg to Kibble–Zurek scaling [PDF]

Quantum Science and Technology, 2021
Phase transitions represent a compelling tool for classical and quantum sensing applications. It has been demonstrated that quantum sensors can in principle saturate the Heisenberg scaling, the ultimate precision bound allowed by quantum mechanics, in ...
L. Garbe, O. Abah, S. Felicetti, R. Puebla   +3 more
semanticscholar   +1 more source

Quantum enhanced metrology based on flipping trajectory of cold Rydberg gases. [PDF]

Nat Commun
Wang YJ, Zhang J, Zhang ZY, Shao SY, Li Q, Chen HC, Ma Y, Han TY, Wang QF, Nan JD, Yin YM, Zhu DY, Fang QQ, Yu C, Liu X, Guo GC, Liu B, Zhang LH, Ding DS, Shi BS.   +19 more
europepmc   +3 more sources

Super-Heisenberg scaling in Hamiltonian parameter estimation in the long-range Kitaev chain

Physical Review Research, 2022
In quantum metrology, nonlinear many-body interactions can enhance the precision of Hamiltonian parameter estimation to surpass the Heisenberg scaling.
Jing Yang, Shengshi Pang, Adolfo del Campo, Andrew N. Jordan   +3 more
doaj   +1 more source

Exponentially Enhanced Quantum Metrology [PDF]

Physical Review Letters, 2008
4 pages, 1 postscript figure ; typos ...
Roy, S. M., Braunstein, Samuel L.
openaire   +3 more sources

Temporal analog of Fabry-Pérot resonator via coherent population trapping

npj Quantum Information, 2021
Ramsey spectroscopy via coherent population trapping (CPT) is essential in precision measurements. The conventional CPT-Ramsey fringes contain numbers of almost identical oscillations and so that it is difficult to identify the central fringe.
Ruihuan Fang, Chengyin Han, Xunda Jiang, Yuxiang Qiu, Yuanyuan Guo, Minhua Zhao, Jiahao Huang, Bo Lu, Chaohong Lee   +8 more
doaj   +1 more source

Probe Incompatibility in Multiparameter Noisy Quantum Metrology [PDF]

Physical Review X, 2021
We derive fundamental bounds on the maximal achievable precision in multiparameter noisy quantum metrology, valid under the most general entanglement-assisted adaptive strategy, which are tighter than the bounds obtained by a direct use of single ...
F. Albarelli, R. Demkowicz-Dobrzański
semanticscholar   +1 more source

Differential Evolution for Many-Particle Adaptive Quantum Metrology [PDF]

, 2013
We devise powerful algorithms based on differential evolution for adaptive many-particle quantum metrology. Our new approach delivers adaptive quantum metrology policies for feedback control that are orders-of-magnitude more efficient and surpass the few-
Crosnier, Cécile, Lovett, Neil B., Perarnau-Llobet, Martí, Sanders, Barry C.   +3 more
core   +3 more sources