Entangling ions with engineered light gradients

• URL: http://arxiv.org/abs/2603.07548v1
• Date: Sun, 08 Mar 2026 09:18:24 GMT
• Title: Entangling ions with engineered light gradients
• Abstract summary: Spectral crowding of collective motional modes limits the fidelity of entangling interactions in trapped-ion quantum processors.<n>We introduce a geometric-phase entangling interaction driven by a transverse, time-dependent structured-light force.<n>We experimentally realise high-fidelity two-qubit gates with error rates below $5times10-3$ in ion crystals containing up to 12 ions confined within a single potential well.
• Score: 54.616816054906025
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Spectral crowding of collective motional modes limits the fidelity of entangling interactions in trapped-ion quantum processors by inducing off-resonant coupling to spectator modes. We introduce a geometric-phase entangling interaction driven by a transverse, time-dependent structured-light force. By applying the force in a plane orthogonal to the optical propagation direction, we suppress the effects of spectral crowding while preserving single-ion addressing. The scheme is compatible with arbitrary qubit encodings, provided that the qubit states experience a differential AC Stark shift. We experimentally realise high-fidelity two-qubit gates with error rates below $5\times10^{-3}$ in ion crystals containing up to 12 ions confined within a single potential well. These results establish gradient-field light-shift gates as a scalable approach to high-fidelity entangling generation in spectrally crowded trapped-ion systems.

Related papers

• Closed-loop control for two-qubit gates with trapped ions [0.0]
  We introduce closed-loop control for two-qubit gates to correct disturbances as they occur during the gate implementation.<n>We show that incorporating a spectator ion is feasible for linear Paul trap implementations.
  arXiv  Detail & Related papers  (2026-07-01T05:32:52Z)
• Transverse Polarization Gradient Entangling Gates for Trapped-Ion Quantum Computation [38.369575982871815]
  entangling gates with individual addressing capability represents a crucial approach for implementing quantum computation in trapped ion crystals.<n>Here, we experimentally demonstrate an alternative method that employs a polarization gradient field generated by a tightly focused laser beam.<n>We perform Raman operations on nuclear spin qubits encoded in 171Yb+ ions, generating spin-dependent forces along axial motional modes in a linear trap.
  arXiv  Detail & Related papers  (2025-06-24T14:59:45Z)
• Probing excited-state dynamics of transmon ionization [47.00361052400629]
  We study the excited-state dynamics induced by strong drives during readout in circuit QED.<n>With up to 10 resolvable states, we quantify the critical photon number of ionization, the resulting state after ionization, and the fraction of the population transferred to highly excited states.
  arXiv  Detail & Related papers  (2025-05-01T16:28:03Z)
• Continuous and Reversible Electrical Tuning of Fluorescent Decay Rate via Fano Resonance [2.3592914313389253]
  We demonstrate that the decay rates of a fluorescent molecule can be controlled by electrically shifting a transparency introduced by a Fano resonance.<n>An auxiliary quantum object (QO) located at the hotspot of a plasmonic nanoparticles suppresses plasmonic excitation at its level spacing omega_QO.<n>By shifting omega_QO via an applied voltage, we tune the radiative and nonradiative decay rates of the fluorescent molecule by up to two orders of magnitude.
  arXiv  Detail & Related papers  (2024-12-28T16:20:19Z)
• Individually Addressed Entangling Gates in a Two-Dimensional Ion Crystal [0.19165511108619063]
  We demonstrate high-fidelity two-qubit entangling gates between any ion pairs in a 2D crystal of four ions. Our work paves the way for ion trap quantum computing with hundreds to thousands of qubits on a 2D ion crystal.
  arXiv  Detail & Related papers  (2024-06-20T05:01:42Z)
• Low-crosstalk optical addressing system for atomic qubits based on multiple objectives and acousto-optic deflectors [36.40918095035564]
  Individual addressing (IA) methods are important for implementing programmable gates in near-term quantum devices.<n>We present a low-crosstalk optical addressing system based on multiple optical objectives and acousto-optic deflectors (AODs) with a symmetrical configuration.
  arXiv  Detail & Related papers  (2023-06-02T07:12:59Z)
• A guided light system for agile individual addressing of Ba$^+$ qubits with $10^{-4}$ level intensity crosstalk [0.0]
  We present a novel, guided-light individual addressing system for hyperfine Ba$+$ qubits. The system takes advantage of laser-written waveguide technology, enabled by the atomic structure of Ba$+$. We demonstrate a nearest neighbour relative intensity crosstalk on the order of 10$-4$, without any active aberration compensation.
  arXiv  Detail & Related papers  (2023-02-28T16:20:18Z)
• Trapped Ion Quantum Computing using Optical Tweezers and the Magnus Effect [0.0]
  We consider the implementation of quantum logic gates in trapped ions using tightly focused optical tweezers. Strong polarization gradients near the tweezer focus lead to qubit-state dependent forces on the ion. We show that these may be used to implement quantum logic gates on pairs of ion qubits in a crystal.
  arXiv  Detail & Related papers  (2023-01-11T19:00:09Z)
• Reminiscence of classical chaos in driven transmons [117.851325578242]
  We show that even off-resonant drives can cause strong modifications to the structure of the transmon spectrum rendering a large part of it chaotic. Results lead to a photon number threshold characterizing the appearance of chaos-induced quantum demolition effects.
  arXiv  Detail & Related papers  (2022-07-19T16:04:46Z)
• Coherent effects contribution to a fast gate fidelity in ion quantum computer [47.187609203210705]
  We develop a numerical model for full simulation of coherence effects using a linear ion microtrap array and a 2D microtrap array. We have also studied the dependency of the gate fidelity on the laser power fluctuations.
  arXiv  Detail & Related papers  (2021-12-12T12:53:00Z)
• Tunable Anderson Localization of Dark States [146.2730735143614]
  We experimentally study Anderson localization in a superconducting waveguide quantum electrodynamics system. We observe an exponential suppression of the transmission coefficient in the vicinity of its subradiant dark modes. The experiment opens the door to the study of various localization phenomena on a new platform.
  arXiv  Detail & Related papers  (2021-05-25T07:52:52Z)
• Ancilla mediated qubit readout and heralded entanglement between rare-earth dopant ions in crystals [68.8204255655161]
  We show how a Bayesian analysis exhausts the information about the state of the qubit from the optical signal of the ancilla ion. We extend the architecture to ions residing in two remote cavities, and we show how continuous monitoring of fluorescence signals from the two ancilla ions leads to entanglement of the qubit ions.
  arXiv  Detail & Related papers  (2020-07-06T16:31:46Z)

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.