Transverse Polarization Gradient Entangling Gates for Trapped-Ion Quantum Computation

Abstract

The construction of entangling gates with individual addressing capability represents a crucial approach for implementing quantum computation in trapped ion crystals. Conventional entangling gate schemes typically rely on laser beam wave vectors to couple the ions' spin and motional degrees of freedom. Here, we experimentally demonstrate an alternative method that employs a polarization gradient field generated by a tightly focused laser beam, previously proposed as a Magnus-type quantum logic gate. Using this technique, we perform Raman operations on nuclear spin qubits encoded in 171Yb+ ions, generating spin-dependent forces along axial motional modes in a linear trap. By utilizing an acousto-optic deflector to create arbitrary spot pairs for individual ion addressing in two-ion (four-ion) chains, we achieve MS gates with fidelities exceeding 98.5% (97.2%). Further improvements in numerical aperture and laser power could reduce gate durations while enhancing fidelity. This method is compatible with, and can significantly simplify, optical tweezer gate proposals, where motional mode engineering enables scalable trapped-ion quantum computation. The technique can be extended to two-dimensional ion crystals, representing a key step toward large-scale trapped-ion quantum processors.

11 pages, 8 figures

References in corpus (36)

• High-fidelity quantum logic gates using trapped-ion hyperfine qubits
• High-fidelity two-qubit quantum logic gates using trapped calcium-43 ions
• Demonstration of the trapped-ion quantum-CCD computer architecture
• High-Fidelity Universal Gate Set for ${}^9$Be${}^{+}$ Ion Qubits
• Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
• Single ion-qubit exceeding one hour coherence time
• Single-qubit quantum memory exceeding $10$-minute coherence time
• Parallel Entangling Operations on a Universal Ion Trap Quantum Computer
• Revealing the invariance of vectorial structured light in perturbing media
• Scalable global entangling gates on arbitrary ion qubits
• Vectorial light-matter interaction -- exploring spatially structured complex light fields
• A long-lived Zeeman trapped-ion qubit
• Robust entanglement gates for trapped-ion qubits
• Efficient Arbitrary Simultaneously Entangling Gates on a trapped-ion quantum computer
• A Site-Resolved 2D Quantum Simulator with Hundreds of Trapped Ions
• Benchmarking a trapped-ion quantum computer with 30 qubits
• Two-qubit entangling gates within arbitrarily long chains of trapped ions
• High-fidelity Two-qubit Gates Using a MEMS-based Beam Steering System for Individual Qubit Addressing
• Scalable and Parallel Tweezer Gates for Quantum Computing with Long Ion Strings
• Controlling two-dimensional Coulomb crystals of more than 100 ions in a monolithic radio-frequency trap
• Continuous Symmetry Breaking in a Trapped-Ion Spin Chain
• Correcting detection error in quantum computation and state engineering through data processing
• Batch Optimization of Frequency-Modulated Pulses for Robust Two-qubit Gates in Ion Chains
• Single-qubit gates with errors at the $10^{-7}$ level
• Scalable, high-fidelity all-electronic control of trapped-ion qubits
• Coherent transfer of the transverse momentum of an optical vortex beam to the motion of a single trapped ion
• Manipulating phonons of a trapped-ion system using optical tweezers
• Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave
• Trapped Ion Quantum Computing using Optical Tweezers and Electric Fields
• Robust two-qubit trapped ions gates using spin-dependent squeezing
• Trapped atoms in spatially-structured vector light fields
• Scalable quantum computing stabilised by optical tweezers on an ion crystal
• Individually Addressed Entangling Gates in a Two-Dimensional Ion Crystal
• Off-axis dipole forces in optical tweezers by an optical analog of the {Magnus} effect
• Entangling gates for trapped-ion quantum computation and quantum simulation
• Cold hybrid electrical-optical ion trap

Cited by in corpus (1)

• High-speed and high-connectivity two-qubit gates in long chains of trapped ions