In the three-step photoionization process under investigation, the atoms present in the 4f126s2 3H6 (0.0 cm-1) ground state are excited to the 4f115d6s2 J = 7 (15,846.549 cm-1) excited level using the first excitation laser tuned to the…
Category: 4. Physics
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Universal conservation law governing the wave–particle duality and quantum entanglement
Sabra, A. I. & Stork, D. G. Theories of light from Descartes to newton. Phys. Today 36, 71–72 (1983).
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Bohr, N. The quantum postulate and the recent development of atomic theory….
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Scientists Unravel the Bizarre Physics of the Mpemba Effect
Scientists are uncovering the mysteries of the Mpemba effect. The Mpemba effect, whereby hotter systems can cool faster than cooler ones under identical conditions, was first noted by Aristotle over 2,000 years ago. It was rediscovered in 1963 by…
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Erbium Ions Apply for Quantum Repeater Job
• Physics 18, s41
Experiments with erbium ions show that they can be used to create entangled photons in the telecom band—an important step in building quantum repeaters.
A quantum repeater is a device—currently…
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Assessing the skills gap for the UK’s quantum missions
Assessing the skills gap for the UK’s quantum missions
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Efficient and practical Hamiltonian simulation from time-dependent product formulas
THRIFT algorithms
Consider a Hamiltonian of the form H = H0 + αH1 where α ≪ 1, the norms of H0 and H1 are comparable, and the unitary \({U}_{0}={e}^{-it{H}_{0}}\) can be implemented exactly for arbitrary times t with an efficient…
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Barren plateaus in variational quantum computing
Cerezo, M. et al. Variational quantum algorithms. Nat. Rev. Phys. 3, 625–644 (2021). Review on variational quantum algorithms presents details for newcomers to the field.
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Bharti,…
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Topological rejection of noise by quantum skyrmions
Quantum skyrmions
As our aim is to study quantum skyrmionic topology in the presence of noise, we begin by constructing a bi-photon entangled state of the form \(\left\vert \Psi \right\rangle=\frac{1}{\sqrt{2}}\left({\left\vert {\ell…
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Demonstration of robust and efficient quantum property learning with shallow shadows
Preliminaries
We begin by reviewing the framework of randomized measurements and classical shadows. Each randomized measurement scheme is defined by an ensemble of unitary operators \({{\mathcal{E}}}\). A random unitary Ui is then sampled…
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Engineering shear polaritons in 2D twisted heterostructures
The realization of HShPs in twisted bilayer α-MoO3
Monoclinic polar crystals, like β-Ga2O3 and CdWO4, exhibit multiple non-orthogonal phonon resonances within given lattice planes, leading to strongly anisotropic optical…
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