Hybrid acousto-optical spin control in quantum dots

• URL: http://arxiv.org/abs/2512.14405v1
• Date: Tue, 16 Dec 2025 13:43:21 GMT
• Title: Hybrid acousto-optical spin control in quantum dots
• Authors: Mateusz Kuniej, Paweł Machnikowski, Michał Gawełczyk,
• Abstract summary: Mechanical degrees of freedom very weakly couple to spins in semiconductors.<n>Inefficient coupling between phonons and single electron spins in semiconductor quantum dots (QDs) hinders their integration into on-chip acoustically coupled quantum hybrid systems.<n>We propose a hybrid acousto-optical spin control method that effectively introduces acoustic spin rotation to QDs.
• Score: 0.05097809301149341
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Mechanical degrees of freedom very weakly couple to spins in semiconductors. The inefficient coupling between phonons and single electron spins in semiconductor quantum dots (QDs) hinders their integration into on-chip acoustically coupled quantum hybrid systems. We propose a hybrid acousto-optical spin control method that circumvents this problem and effectively introduces acoustic spin rotation to QDs, complementing their rich couplings with external fields and quantum registers. We show that combining continuous-wave detuned optical coupling to a trion state and acoustic modulation results in spin rotation around an axis defined by the acoustic field. The optical field breaks spin conservation, allowing phonons to drive transitions between disrupted spin states when at resonance with the Zeeman frequency. Our method is compatible with pulse sequences that mitigate quasi-static noise effects, which makes trion recombination the primary limitation to gate fidelity under cooled nuclear-spin conditions. Numerical simulations indicate that spin rotation fidelity can be very high, if the trion lifetime is long and Zeeman splitting is sufficiently large, with a currently feasible 50~ns lifetime and 44~GHz splitting giving 99.9\% fidelity. Applying our advancement could enable acoustic QD spin state transfer to diverse solid-state systems and transduction between acoustic, optical, and microwave domains, all within an on-chip integration-ready setting.

Related papers

• All-mechanical coherence protection and fast control of a spin qubit [1.2491895753516362]
  In a phononic quantum network, quantum information is stored and processed within stationary nodes defined by solid-state spins.<n>We show record-high Rabi frequencies reaching 800 MHz, which allows for ultrafast quantum control.
  arXiv  Detail & Related papers  (2025-08-18T20:47:44Z)
• Electrically tunable quantum interference of atomic spins on surfaces [43.73138793116028]
  We demonstrate electrical control of quantum interference using atomic spins on an insulating film in a scanning tunneling microscope.<n>We modulate the atomically-confined magnetic interaction between the probe tip and surface atoms with a strong electric field, and drive the spin state rapidly through the energy-level anticrossing.<n>Results open new avenues for all-electrical quantum manipulation in spin-based quantum processors.
  arXiv  Detail & Related papers  (2025-06-01T14:28:36Z)
• Spin Squeezing of Macroscopic Nuclear Spin Ensembles [44.99833362998488]
  Squeezing macroscopic spin ensembles may prove to be a useful technique for fundamental physics experiments.<n>We analyze the squeezing dynamics in the presence of decoherence and finite spin polarization, showing that achieving 7 dB spin squeezing is feasible in several nuclear spin systems.
  arXiv  Detail & Related papers  (2025-02-19T21:16:54Z)
• Ultra-high strained diamond spin register with coherent optical link [45.40010446596688]
  Solid-state spin defects, such as color centers in diamond, are among the most promising candidates for scalable and integrated quantum technologies. We show that leveraging an ultra-high strained silicon-vacancy center inside a nanodiamond allows us to coherently and efficiently control its electron spin, while mitigating phonon-induced dephasing at liquid helium temperature. Our work paves the way for future integration of quantum network registers into conventional, well-established photonics and hybrid quantum communication systems.
  arXiv  Detail & Related papers  (2024-09-19T10:46:24Z)
• Cavity-mediated entanglement of parametrically driven spin qubits via sidebands [0.0]
  We consider a pair of quantum dot-based spin qubits that interact via microwave photons in a superconducting cavity, and that are also parametrically driven by separate external electric fields. We show that the sidebands generated via the driving fields enable highly tunable qubit-qubit entanglement using only ac control.
  arXiv  Detail & Related papers  (2023-07-12T10:35:43Z)
• Optically driven spin precession in polariton condensates [0.0]
  We introduce an all-optically driven spin precession in microcavity polariton condensates. We realise several GHz driven spin precession with a macroscopic spin coherence time that is limited only by the extraneous to the condensate. Our observations are supported by mean field modelling and evidence a driven-dissipative quantum fluidic analogue of the nuclear magnetic resonance effect.
  arXiv  Detail & Related papers  (2023-05-05T18:30:24Z)
• Multi-Stability in Cavity QED with Spin-Orbit Coupled Bose-Einstein Condensate [0.0]
  We investigate the occurrence of steady-state multi-stability in a cavity system containing spin-orbit coupled Bose-Einstein condensate. We show the emergence of multi-stable behavior of cavity photon number, which is unlike with previous investigation on cavity-atom systems. We illustrate the emergence of secondary interface mediated by increasing the mechanical dissipation rate of the pseudo-spin states.
  arXiv  Detail & Related papers  (2023-02-04T11:24:22Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• 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)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• Demonstration of electron-nuclear decoupling at a spin clock transition [54.088309058031705]
  Clock transitions protect molecular spin qubits from magnetic noise. linear coupling to nuclear degrees of freedom causes a modulation and decay of electronic coherence. An absence of quantum information leakage to the nuclear bath provides opportunities to characterize other decoherence sources.
  arXiv  Detail & Related papers  (2021-06-09T16:23:47Z)
• Acoustically induced coherent spin trapping [0.0]
  Hybrid spin-optomechanical quantum systems offer high flexibility, integrability and applicability for quantum science and technology. On-chip surface acoustic waves (SAWs) can efficiently drive spin transitions in the ground states (GSs) of atomic-scale, color centre qubits. We show that strain-induced spin interactions within their optically excited state (ES) can exceed by two orders of magnitude the ones within the GS.
  arXiv  Detail & Related papers  (2021-04-07T09:32:02Z)
• Probing the coherence of solid-state qubits at avoided crossings [51.805457601192614]
  We study the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings. The proposed theoretical approach paves the way to designing the coherence properties of spin qubits from first principles.
  arXiv  Detail & Related papers  (2020-10-21T15:37:59Z)

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.