Related papers: Effect of Closely-Spaced Excited States on Electromagnetically Induced Transparency

Effect of Closely-Spaced Excited States on Electromagnetically Induced Transparency

URL: http://arxiv.org/abs/1912.12267v2
Date: Sat, 17 Apr 2021 05:09:03 GMT
Title: Effect of Closely-Spaced Excited States on Electromagnetically Induced Transparency
Authors: Saesun Kim and Alberto M. Marino
Abstract summary: Electromagnetically induced transparency (EIT) is a well-known phenomenon due in part to its applicability to quantum devices such as quantum memories and quantum gates. We present a theoretical study of the effect of two closely-spaced excited states on EIT and off-resonance Raman transitions.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Electromagnetically induced transparency (EIT) is a well-known phenomenon due in part to its applicability to quantum devices such as quantum memories and quantum gates. EIT is commonly modeled with a three-level lambda system due to the simplicity of the calculations. However, this simplified model does not capture all the physics of EIT experiments with real atoms. We present a theoretical study of the effect of two closely-spaced excited states on EIT and off-resonance Raman transitions. We find that the coherent interaction of the fields with two excited states whose separation is smaller than their Doppler broadened linewidth can enhance the EIT transmission and broaden the width of the EIT peak. However, a shift of the two-photon resonance frequency for systems with transitions of unequal dipole strengths leads to a reduction of the maximum transparency that can be achieved when Doppler broadening is taken into account even under ideal conditions of no decoherence. As a result, complete transparency cannot be achieved in a vapor cell. Only when the separation between the two excited states is of the order of the Doppler width or larger can complete transparency be recovered. In addition, we show that off-resonance Raman absorption is enhanced and its resonance frequency is shifted. Finally, we present experimental EIT measurements on the D1 line of $^{85}$Rb that agree with the theoretical predictions when the interaction of the fields with the four levels is taken into account.

Related papers

Visualizing Dynamics of Charges and Strings in (2+1)D Lattice Gauge Theories [103.95523007319937]
We study the dynamics of local excitations in a lattice of superconducting qubits. For confined excitations, the magnetic field induces a tension in the string connecting them. Our method allows us to experimentally image string dynamics in a (2+1)D LGT.
arXiv Detail & Related papers (2024-09-25T17:59:05Z)
Doppler-assisted quantum resonances through swappable excitation pathways in Potassium vapor [0.0]
We report the observation of two additional sub-natural line width quantum interference in the $D$ manifold of $39K$ vapor. The other two features appear exclusively because $39K$ ground hyperfine splitting is smaller than the Doppler broadened absorption profile.
arXiv Detail & Related papers (2024-03-27T07:45:04Z)
Nonreciprocal recovery of electromagnetically induced transparency by wavenumber mismatch in hot atoms [0.0699049312989311]
In a three-level atomic ladder-system, Doppler broadening limits the visibility of electromagnetically-induced transparency (EIT) when the probe and control fields are co-propagating. We show the underlying mechanism to be an avoided crossing of the states dressed by the coupling laser as a function of atomic velocities when $k_pk_c$. We investigate how the non-reciprocity scales with wavelength mismatch and show how to experimentally demonstrate the effect in a simple Rydberg-EIT system using thermal Rubidium atoms.
arXiv Detail & Related papers (2024-03-03T16:11:16Z)
Measurement-Induced Transmon Ionization [69.65384453064829]
We develop a comprehensive framework which provides a physical picture of the origin of transmon ionization. This framework identifies the multiphoton resonances responsible for transmon ionization. It also allows one to efficiently compute numerical estimates of the photon number threshold for ionization.
arXiv Detail & Related papers (2024-02-09T18:46:50Z)
Hyper-entanglement between pulse modes and frequency bins [101.18253437732933]
Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols. We demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins.
arXiv Detail & Related papers (2023-04-24T15:43:08Z)
Formation of robust bound states of interacting microwave photons [148.37607455646454]
One of the hallmarks of interacting systems is the formation of multi-particle bound states. We develop a high fidelity parameterizable fSim gate that implements the periodic quantum circuit of the spin-1/2 XXZ model. By placing microwave photons in adjacent qubit sites, we study the propagation of these excitations and observe their bound nature for up to 5 photons.
arXiv Detail & Related papers (2022-06-10T17:52:29Z)
Electromagnetically induced transparency in inhomogeneously broadened divacancy defect ensembles in SiC [52.74159341260462]
Electromagnetically induced transparency (EIT) is a phenomenon that can provide strong and robust interfacing between optical signals and quantum coherence of electronic spins. We show that EIT can be established with high visibility also in this material platform upon careful design of the measurement geometry. Our work provides an understanding of EIT in multi-level systems with significant inhomogeneities, and our considerations are valid for a wide array of defects in semiconductors.
arXiv Detail & Related papers (2022-03-18T11:22:09Z)
Sensitivity of electromagnetically induced transparency to light-mediated interactions [0.0]
We consider an ensemble of cold three-level atoms, in a $Lambda$ configuration, scattering a probe and a control field to the vacuum modes of the electromagnetic field. We show that the light-mediated long-range interactions that emerge between the dipoles narrow the EIT transparency window for increasing densities and sample sizes.
arXiv Detail & Related papers (2021-04-01T20:47:17Z)
Superposition of two-mode squeezed states for quantum information processing and quantum sensing [55.41644538483948]
We investigate superpositions of two-mode squeezed states (TMSSs) TMSSs have potential applications to quantum information processing and quantum sensing.
arXiv Detail & Related papers (2021-02-01T18:09:01Z)
Synthesizing electromagnetically induced transparency without a control field in waveguide QED using small and giant atoms [0.0]
electromagnetically induced transparency (EIT) is a narrow transparency window associated with a fluorescence quench at its center frequency. EIT is common in waveguide quantum electrodynamics when multiple closely spaced quantum emitters are coupled to a waveguide. We study a number of different setups with two-level atoms in waveguide QED that all exhibit EIT-like transparency windows.
arXiv Detail & Related papers (2020-11-30T18:18:19Z)

This list is automatically generated from the titles and abstracts of the papers in this site.