Investigating Quantum Coherence by Negative Excursions of the Wigner Quasi-Distribution

Ballicchia, Mauro; Ferry, D. K.; Nedjalkov, Mihail; Weinbub, Josef

doi:10.3390/app9071344

Cited by 8 publications

(5 citation statements)

References 32 publications

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“…However, our method does not capture entanglement or correlations in the motional state of different atoms. It remains an interesting question whether the Wigner function measurement scheme can be extended to study correlations in a many-body state [48,49].…”

Section: Discussionmentioning

confidence: 99%

Direct measurement of the Wigner function of atoms in an optical trap

Winkelmann¹,

Weidner²,

Ramola³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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We present a scheme to directly probe the Wigner function of the motional state of a neutral atom confined in an optical trap. The proposed scheme relies on the well-established fact that the Wigner function at a given point $(x,p)$ in phase space is proportional to the expectation value of the parity operator relative to that point. In this work, we show that the expectation value of the parity operator can be directly measured using two auxiliary internal states of the atom: parity-even and parity-odd motional states are mapped to the two internal states of the atom through a Ramsey interferometry scheme. The Wigner function can thus be measured point-by-point in phase space with a single, direct measurement of the internal state population. Numerical simulations show that the scheme is robust in that it applies not only to deep, harmonic potentials but also to shallower, anharmonic traps.

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Section: Discussionmentioning

confidence: 99%

Direct measurement of the Wigner function of atoms in an optical trap

Winkelmann¹,

Weidner²,

Ramola³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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“…The Wigner function negativity indicates the quantum behavior of a state. 35 We thus also investigated the negativity along y , Neg w ( y ), integrating over the momentum p and over x .…”

Section: Magnetic Field Effects In the Quantum Evolutionmentioning

confidence: 99%

Non-uniform magnetic fields for single-electron control

Ballicchia,

Etl,

Nedjalkov

et al. 2024

Nanoscale

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“…Reproduced from [178]. CC BY 4.0. investigated the relation between quantum coherence, interference, and the negative parts of the Wigner quasi-distribution in a beam splitter structure using ViennaWD [176].…”

Section: Waveguides and Electron Dynamicsmentioning

confidence: 99%

Computational perspective on recent advances in quantum electronics: from electron quantum optics to nanoelectronic devices and systems

Weinbub

Kosik

2022

J. Phys.: Condens. Matter

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Quantum electronics has significantly evolved over the last decades. Where initially the clear focus was on light-matter interactions, nowadays approaches based on the electron's wave nature have solidified themselves as additional focus areas. This development is largely driven by continuous advances in electron quantum optics, electron based quantum information processing, electronic materials, and nanoelectronic devices and systems. The pace of research in all of these areas is astonishing and is accompanied by substantial theoretical and experimental advancements. What is particularly exciting is the fact that the computational methods, together with broadly available large-scale computing resources, have matured to such a degree so as to be essential enabling technologies themselves. These methods allow to predict, analyze, and design not only individual physical processes but also entire devices and systems, which would otherwise be very challenging or sometimes even out of reach with conventional experimental capabilities. This review is thus a testament to the increasingly towering importance of computational methods for advancing the expanding field of quantum electronics. To that end, computational aspects of a representative selection of recent research in quantum electronics are highlighted where a major focus is on the electron's wave nature. By categorizing the research into concrete technological applications, researchers and engineers will be able to use this review as a source for inspiration regarding problem-specific computational methods.

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Investigating Quantum Coherence by Negative Excursions of the Wigner Quasi-Distribution

Cited by 8 publications

References 32 publications

Direct measurement of the Wigner function of atoms in an optical trap

Direct measurement of the Wigner function of atoms in an optical trap

Non-uniform magnetic fields for single-electron control

Computational perspective on recent advances in quantum electronics: from electron quantum optics to nanoelectronic devices and systems

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