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14 papers · 2 filters
Spectrally uncorrelated biphotons generated from `the family of BBO crystal'
Rui-Bo Jin, Wu-Hao Cai, Chunling Ding +4
Spectrally intrinsically uncorrelated biphoton states generated from nonlinear crystals are very important but rare resources for quantum photonics and quantum information applicat…
Quantum Circuit Parameters Learning with Gradient Descent Using Backpropagation
Masaya Watabe, Kodai Shiba, Masaru Sogabe +2
Quantum computing has the potential to outperform classical computers and is expected to play an active role in various fields. In quantum machine learning, a quantum computer has…
Quantum state estimation with nuisance parameters
Jun Suzuki, Yuxiang Yang, Masahito Hayashi
In parameter estimation, nuisance parameters refer to parameters that are not of interest but nevertheless affect the precision of estimating other parameters of interest. For inst…
Heralded single photon and correlated photon pair generation via spontaneous four-wave mixing in tapered optical fibers
A. A. Shukhin, J. Keloth, K. Hakuta +1
We study the generation of correlated photon pairs and heralded single photons via strongly non-degenerate spontaneous four-wave mixing (SFWM) in a series of identical micro-/nano…
Uncertainty relation for the position of an electron in a uniform magnetic field from quantum estimation theory
Shin Funada, Jun Suzuki
We investigate the uncertainty relation for estimating the position of one electron in a uniform magnetic field in the framework of the quantum estimation theory. Two kinds of mome…
Coherence cost for violating conservation laws
Hiroyasu Tajima, Naoto Shiraishi, Keiji Saito
Nature imposes many restrictions on the operations that we perform. Many of these restrictions can be interpreted in terms of {\it resource} required to realize the operations. Cla…