Coherent phase control of orbital-angular-momentum light-induced torque in a double-tripod atom-light coupling scheme

• URL: http://arxiv.org/abs/2512.17537v1
• Date: Fri, 19 Dec 2025 13:01:37 GMT
• Title: Coherent phase control of orbital-angular-momentum light-induced torque in a double-tripod atom-light coupling scheme
• Authors: Hamid R. Hamedi, Viačeslav Kudriašov, Mažena Mackoit-Sinkevičienė, Julius Ruseckas,
• Abstract summary: We investigate a phase-controllable mechanism for generating optical torque in a five-level double-tripod atom-light coupling scheme.<n>We show that the DT system coherently reconfigures into either coupled or double- schemes depending on the relative phases.<n>This enables precise phase control of the atomic current flow, with potential applications in quantum control, precision measurement, and quantum information processing.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate a phase-controllable mechanism for generating optical torque in a five-level double-tripod (DT) atom-light coupling scheme interacting with four strong coherent control fields as well as two weak optical vortex probe beams carrying orbital angular momentum (OAM). The spatial phase gradients of the OAM-carrying probes induce a quantized torque that is transferred to the atoms, rotating them and generating a directed atomic flow within an annular geometry. Analytical solutions of the optical Bloch equations under steady-state conditions show that the induced torque and resulting rotational motion exhibit high sensitivity to phase variations. We show that the DT system coherently reconfigures into either coupled Λ or double-Λ schemes depending on the relative phases, with each configuration exhibiting distinct quantized torque characteristics. This enables precise phase control of the atomic current flow, with potential applications in quantum control, precision measurement, and quantum information processing.

Related papers

• Emergence of Turbulence in a counterflow geometry of 2D Polariton Quantum Fluids [0.0]
  We numerically investigate the nonlinear dynamics of a two-dimensional exciton-polariton quantum fluid driven by two counter-propagating laser beams.<n>We identify four distinct regimes-linear, solitonic, turbulent, and superfluid-emerging from the interplay between pump strength, laser detuning, and injected momentum.
  arXiv  Detail & Related papers  (2026-03-05T12:53:14Z)
• Controlling emergent dynamical behavior via phase-engineered strong symmetries [0.0]
  We show that a tunable phase in the collective light-matter coupling of a cavity QED system induces a phase-dependent strong symmetry of the Liouvillian.<n>We demonstrate that tuning this phase substantially reduces the critical driving strength for dissipative phase transitions between stationary and non-stationary phases.
  arXiv  Detail & Related papers  (2026-02-20T19:00:23Z)
• Quantum gates in coupled quantum dots controlled by coupling modulation [41.99844472131922]
  We studied the dynamics of a pair of single-electron double quantum dots (DQD) under longitudinal and transverse static magnetic fields.<n>We propose to modulate the tunnel coupling between the QDs to produce one-qubit gates and the exchange coupling between DQDs to generate entangling gates.
  arXiv  Detail & Related papers  (2025-10-02T17:46:42Z)
• Optimal control of geometric phase in pairs of interacting atoms traveling along two-dimensional closed paths [0.0]
  We propose a scheme inducing a non-trivial Aharonov-Anandan geometric phase in pairs of atoms interacting via dipole-dipole potential.<n>Our protocol relies on mobile optical trap technology and consists of steering a single atom along a closed loop.<n>The stability of our scheme in the presence of noise or experimental imperfections is discussed.
  arXiv  Detail & Related papers  (2025-04-15T15:06:40Z)
• Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling [83.88591755871734]
  We study theoretically an array of two-level qubits moving relative to a one-dimensional waveguide. When the frequency of this motion approaches twice the qubit resonance frequency, it induces parametric generation of photons and excitation of the qubits. We develop a comprehensive general theoretical framework that incorporates both perturbative diagrammatic techniques and a rigorous master-equation approach.
  arXiv  Detail & Related papers  (2024-08-30T15:54:33Z)
• Steady-state phases and interaction-induced depletion in a driven-dissipative chirally-coupled dissimilar atomic array [0.0]
  We study the steady-state phases of atomic excitations under a weakly-driven condition of laser field. We reveal an intricate role of the atom at the interface of the dissimilar array in determining the steady-state phases. Our results can provide insights in the driven-dissipative quantum phases of atomic excitations with nonreciprocal couplings.
  arXiv  Detail & Related papers  (2023-11-24T15:49:04Z)
• Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy [0.3586100057780835]
  We report on the first demonstration of a coherently controlled inter-dot tunnel-coupling. We use ultrafast four-wave mixing spectroscopy to generate a quantum coherence in one trion complex, transfer it to and probe it in another trion configuration. With the help of theoretical modelling on different levels of complexity we give an instructive explanation of the underlying coupling mechanism and dynamical processes.
  arXiv  Detail & Related papers  (2023-04-20T08:14:45Z)
• Simultaneous Quantum Squeezing of Light Polarizations and Atomic Spins in a Cold Atomic Gas [0.0]
  We present a scheme to realize simultaneous quantum squeezing of light polarizations and atomic spins via a double electromagnetically induced transparency (DEIT) We derive two coupled quantum nonlinear Schr"odinger equations from Maxwell-Heisenberg-Langevin equations describing the quantum dynamics of the atoms and the probe pulse. The results of the simultaneous squeezing of light polarizations and atomic spins by using only a coherent probe pulse reported here opens a route for uncovering the unique property of the quantum interface between light and atomic ensembles.
  arXiv  Detail & Related papers  (2023-03-15T12:02:27Z)
• Tuning long-range fermion-mediated interactions in cold-atom quantum simulators [68.8204255655161]
  Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior. Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
  arXiv  Detail & Related papers  (2022-03-31T13:32:12Z)
• Controlled coherent dynamics of [VO(TPP)], a prototype molecular nuclear qudit with an electronic ancilla [50.002949299918136]
  We show that [VO(TPP)] (vanadyl tetraphenylporphyrinate) is a promising system suitable to implement quantum computation algorithms. It embeds an electronic spin 1/2 coupled through hyperfine interaction to a nuclear spin 7/2, both characterized by remarkable coherence.
  arXiv  Detail & Related papers  (2021-03-15T21:38:41Z)
• Engineering multipartite entangled states in doubly pumped parametric down-conversion processes [68.8204255655161]
  We investigate the quantum state generated by optical parametric down-conversion in a $chi(2) $ medium driven by two modes. The analysis shows the emergence of multipartite, namely 3- or 4-partite, entangled states in a subset of the modes generated by the process.
  arXiv  Detail & Related papers  (2020-07-23T13:53:12Z)
• Waveguide quantum optomechanics: parity-time phase transitions in ultrastrong coupling regime [125.99533416395765]
  We show that the simplest set-up of two qubits, harmonically trapped over an optical waveguide, enables the ultrastrong coupling regime of the quantum optomechanical interaction. The combination of the inherent open nature of the system and the strong optomechanical coupling leads to emerging parity-time (PT) symmetry. The $mathcalPT$ phase transition drives long-living subradiant states, observable in the state-of-the-art waveguide QED setups.
  arXiv  Detail & Related papers  (2020-07-04T11:02:20Z)
• 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)

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.