Observing coherences with time-resolved photoemission
- URL: http://arxiv.org/abs/2005.08978v1
- Date: Mon, 18 May 2020 18:00:02 GMT
- Title: Observing coherences with time-resolved photoemission
- Authors: Alexander F. Kemper, Avinash Rustagi
- Abstract summary: We discuss the potential creation and measurement of coherences in both dispersive solids and qubit-like single levels using current generation time- and angle-resolved photoemission technology.
We show that in both cases, when both the pump and the probe overlap energetically with the coherent levels, that the time-resolved photoemission signal shows a beating pattern at the energy difference between the levels.
In the case of dispersive bands, this leads to momentum-dependent oscillations, which may be used to map out small energy scales in the band structure.
- Score: 77.34726150561087
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We discuss the potential creation and measurement of coherences in both
dispersive solids and qubit-like single levels using current generation time-
and angle-resolved photoemission technology. We show that in both cases, when
both the pump and the probe overlap energetically with the coherent levels, and
when the probe preferentially measures one level as compared to the other, that
the time-resolved photoemission signal shows a beating pattern at the energy
difference between the levels. In the case of dispersive bands, this leads to
momentum-dependent oscillations, which may be used to map out small energy
scales in the band structure. We further develop the two-sided Feynman diagrams
for time-resolved photoemission, and discuss the measurement of decoherence to
gain insight into the characteristics of qubit and dispersive bands.
Related papers
- Biphoton State Reconstruction via Phase Retrieval Methods [0.0]
We show how one can infer the spatial structure of bi-photons generated by spontaneous parametric down conversion.
A spatially resolved analysis of the second-order correlations allows us to isolate the moduli of the pump and phasematching contributions to the two-photon states.
arXiv Detail & Related papers (2024-03-11T16:56:37Z) - Telling emissions apart in a multiphoton resonance: visualizing a
conditional evolution [0.0]
We find that the phase-space representation of the electromagnetic field inside a driven cavity strongly coupled to a two-level atom can be employed to distinguish photon emissions.
The emissions are told apart by means of the different quantum beats generated by the conditional states they prepare.
arXiv Detail & Related papers (2022-11-22T10:18:30Z) - Two-photon emission in detuned resonance fluorescence [0.0]
We discuss two-photon correlations from the side peaks that are formed when a two-level system emitter is driven coherently.
We show that their combination leads to a neat picture compatible with perturbative two-photon scattering.
This should help to control, enhance and open new regimes of multiphoton emission.
arXiv Detail & Related papers (2022-10-07T17:59:38Z) - Quantum asymmetry and noisy multi-mode interferometry [55.41644538483948]
Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator.
We show that the asymmetry may emphincrease as a result of a emphdecrease of coherence inside a degenerate subspace.
arXiv Detail & Related papers (2021-07-23T07:30:57Z) - Distinguishability and "which pathway" information in multidimensional
interferometric spectroscopy with a single entangled photon-pair [0.0]
Photon exchange-phase and degree of distinguishability have not been widely utilized in quantum-enhanced applications.
We show that even at low degree entanglement, when a two-photon wave-function is coupled to matter, it is encoded with a reliable "which pathway?" information.
We find that quantum-light interferometry facilitates utterly different set of time-delay variables, which are unbound by uncertainty to the inverse bandwidth of the wave-packet.
arXiv Detail & Related papers (2021-07-12T07:19:58Z) - Two-photon resonance fluorescence of two interacting non-identical
quantum emitters [77.34726150561087]
We study a system of two interacting, non-indentical quantum emitters driven by a coherent field.
We show that the features imprinted by the two-photon dynamics into the spectrum of resonance fluorescence are particularly sensitive to changes in the distance between emitters.
This can be exploited for applications such as superresolution imaging of point-like sources.
arXiv Detail & Related papers (2021-06-04T16:13:01Z) - Qubit-photon bound states in topological waveguides with long-range
hoppings [62.997667081978825]
Quantum emitters interacting with photonic band-gap materials lead to the appearance of qubit-photon bound states.
We study the features of the qubit-photon bound states when the emitters couple to the bulk modes in the different phases.
We consider the coupling of emitters to the edge modes appearing in the different topological phases.
arXiv Detail & Related papers (2021-05-26T10:57:21Z) - Entangled Two-Photon Absorption Spectroscopy with Varying Pump
Wavelength [0.0]
In virtual-state spectroscopy, information about the energy-level structure of an arbitrary sample is retrieved by Fourier transforming sets of measured two-photon absorption probabilities.
We propose and discuss an extension of entangled two-photon absorption spectroscopy that solves this problem by means of repeated measurements at different pump wavelengths.
arXiv Detail & Related papers (2021-04-23T15:28:40Z) - Hyperentanglement in structured quantum light [50.591267188664666]
Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols.
Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector-vortex structured modes.
We generate highly entangled photon pairs at telecom wavelength that we characterise via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities.
arXiv Detail & Related papers (2020-06-02T18:00:04Z) - Entanglement dynamics in dissipative photonic Mott insulators [62.997667081978825]
In spite of particle losses the quantum entanglement propagation exhibits a ballistic character with propagation speeds related to the differerent quasiparticles that are involved in the dynamics.
Our analysis reveals that photon dissipation has a strikingly asymmetric behavior in the two configurations with a much more dramatic role on the holon entanglement propagation than for the doublon case.
arXiv Detail & Related papers (2020-04-27T15:48:24Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.