Fast Quantum Gates for Neutral Atoms Separated by a Few Tens of Micrometers

• URL: http://arxiv.org/abs/2511.20437v1
• Date: Tue, 25 Nov 2025 16:11:07 GMT
• Title: Fast Quantum Gates for Neutral Atoms Separated by a Few Tens of Micrometers
• Authors: Matteo Bergonzoni, Rosario Roberto Riso, Guido Pupillo,
• Abstract summary: We present a family of fast and high-fidelity two-qubit iSWAP gates between neutral atoms separated by more than 20 um.<n>We harness coherent excitation-exchange-deexcitation dynamics between the qubit and the Rydberg states within a single and smooth laser pulse.<n>This enables entanglement well beyond the blockade radius, offering a route toward fast, high-connectivity quantum processors.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a theoretical scheme for a family of fast and high-fidelity two-qubit iSWAP gates between neutral atoms separated by more than 20 um, enabled by resonant dipole-dipole spin-exchange interactions between Rydberg states. The protocol harnesses coherent excitation-exchange-deexcitation dynamics between the qubit and the Rydberg states within a single and smooth laser pulse, in the presence of strong dipole-dipole interactions. We utilize optimal control methods to achieve theoretical gate fidelities and durations comparable to blockade-based gates in the presence of relevant noise, while extending the effective interaction range by an order of magnitude. This enables entanglement well beyond the blockade radius, offering a route toward fast, high-connectivity quantum processors.

Related papers

• 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 with Magnetic Dipoles [37.93140485169168]
  Entanglement can improve the measurement precision of quantum sensors beyond the shot noise limit.<n>We take advantage of the magnetic dipole-dipole interaction native to most neutral atoms to realize spin-squeezed states.<n>We achieve 7.1 dB of metrologically useful squeezing using the finite-range spin exchange interactions in an erbium quantum gas microscope.
  arXiv  Detail & Related papers  (2024-11-11T18:42:13Z)
• Fast entangling gates for Rydberg atoms via resonant dipole-dipole interaction [0.0]
  We introduce a novel scheme for entangling gates using four atomic levels per atom.<n>A laser field couples the qubit to one of the two Rydberg states, while a microwave field drives transitions between the two Rydberg states.<n>We show that controlled-Z gates can be realized in this scheme without requiring optical phase modulation.
  arXiv  Detail & Related papers  (2024-11-07T19:00:08Z)
• Interacting Circular Rydberg Atoms Trapped in Optical Tweezers [0.0]
  Circular Rydberg atoms (CRAs) ideally combine long coherence times and strong interactions. We report the measurement and characterization of the resonant dipole-dipole interaction between two CRAs.
  arXiv  Detail & Related papers  (2024-07-04T18:24:53Z)
• Fast entangling quantum gates with almost-resonant modulated driving [7.663114782454964]
  off-resonant modulated driving (ORMD) with a special category of synthetic analytical pulses has improved the experimental performance of two- and multi-qubit gates. We design and analyze the entangling quantum gates via the almost-resonant driving (ARMD) method.
  arXiv  Detail & Related papers  (2024-02-09T16:16:58Z)
• A high-flux source system for matter-wave interferometry exploiting tunable interactions [33.92525320044496]
  Atom interferometers allow determining inertial effects to high accuracy. Here we report on a high-flux source of ultra-cold atoms with free expansion rates near the Heisenberg limit directly upon release from the trap.
  arXiv  Detail & Related papers  (2023-07-13T14:10:53Z)
• Dipolar quantum solids emerging in a Hubbard quantum simulator [45.82143101967126]
  Long-range and anisotropic interactions promote rich spatial structure in quantum mechanical many-body systems. We show that novel strongly correlated quantum phases can be realized using long-range dipolar interaction in optical lattices. This work opens the door to quantum simulations of a wide range of lattice models with long-range and anisotropic interactions.
  arXiv  Detail & Related papers  (2023-06-01T16:49:20Z)
• Robust Oscillator-Mediated Phase Gates Driven by Low-Intensity Pulses [0.0]
  We present a method that leads to faster-than-dispersive entanglement gates with low-intensity pulses. Our method is applicable to any quantum platform that has qubits interacting with bosonic mediators via longitudinal coupling. We show that entanglement gates with infidelities of $10-3$ or $10-4$ are possible with current or near-future experimental setups.
  arXiv  Detail & Related papers  (2022-09-29T14:30:26Z)
• 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)
• Ultrafast energy exchange between two single Rydberg atoms on the nanosecond timescale [0.0]
  We observe an interaction-driven energy exchange occuring in a timescale of nanoseconds, two orders of magnitude faster than in any previous work with Rydberg atoms. This opens the path for quantum simulation and computation operating at the speed-limit set by dipole-dipole interactions with this ultrafast Rydberg platform.
  arXiv  Detail & Related papers  (2021-11-24T07:56:52Z)
• Fast high-fidelity single-qubit gates for flip-flop qubits in silicon [68.8204255655161]
  flip-flop qubit is encoded in the states with antiparallel donor-bound electron and donor nuclear spins in silicon. We study the multilevel system that is formed by the interacting electron and nuclear spins. We propose an optimal control scheme that produces fast and robust single-qubit gates in the presence of low-frequency noise.
  arXiv  Detail & Related papers  (2021-01-27T18:37:30Z)
• 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.