High-fidelity laser-free universal control of two trapped ion qubits

Srinivas, R.; Burd, S. C.; Knaack, H. M.; Sutherland, R. T.; Kwiatkowski, A.; Glancy, S.; Knill, E.; Wineland, D. J.; Leibfried, D.; Wilson, A. C.; Allcock, D. T. C.; Slichter, D. H.

doi:10.48550/arxiv.2102.12533

Cited by 8 publications

(10 citation statements)

References 44 publications

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“…MS gates are very successful in two-ion chains [35][36][37][38]. However, in long ion-chains, the gates have an increased sensitivity to even small implementation imperfections.…”

Section: Robust Entangling Gatesmentioning

confidence: 99%

A trapped ion quantum computer with robust entangling gates and quantum coherent feedback

Manovitz¹,

Shapira²,

Gazit³

et al. 2021

Preprint

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Quantum computers are expected to achieve a significant speed-up over classical computers in solving a range of computational problems. Chains of ions held in a linear Paul trap are a promising platform for constructing such quantum computers, due to their long coherence times and high quality of control. Here we report on the construction of a small, five-qubit, universal quantum computer using 88 Sr + ions in an RF trap. All basic operations, including initialization, quantum logic operations, and readout, are performed with high fidelity. Selective two-qubit and single-qubit gates, implemented using a narrow linewidth laser, comprise a universal gate set, allowing realization of any unitary on the quantum register. We review the main experimental tools, and describe in detail unique aspects of the computer: the use of robust entangling gates and the development of a quantum coherent feedback system through EMCCD camera acquisition. The latter is necessary for carrying out quantum error correction protocols in future experiments.

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“…MS gates are very successful in two-ion chains [35][36][37][38]. However, in long ion-chains, the gates have an increased sensitivity to even small implementation imperfections.…”

Section: Robust Entangling Gatesmentioning

confidence: 99%

A trapped ion quantum computer with robust entangling gates and quantum coherent feedback

Manovitz¹,

Shapira²,

Gazit³

et al. 2021

Preprint

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“…In addition to the near-perfect coherence properties [3,4] and single-qubit gates with error rates below 10 −4 [5][6][7][8], trapped ion qubits have significant advantages in entangling gate fidelities. For systems with exactly two ions, state-of-art two-qubit gates reached a fidelity higher than 99.9% by applying state-dependent force with lasers [9,10] or magnetic field gradients [11]. For larger systems, two-qubit gate fidelities > 99% for a four-ion chain [12] and > 97% for 13-ion and 17-ion chains [13,14] have been reported.…”

Section: Introductionmentioning

confidence: 99%

Batch Optimization of Frequency-Modulated Pulses for Robust Two-qubit Gates in Ion Chains

Kang,

Liang,

Zhang

et al. 2021

Preprint

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Two-qubit gates in trapped ion quantum computers are generated by applying spin-dependent forces that temporarily entangle the internal state of the ion with its motion. Laser pulses are carefully designed to generate a maximally entangling gate between the ions while minimizing any residual entanglement between the motion and the ion. The quality of the gates suffers when actual experimental parameters differ from the ideal case. Here we improve the robustness of frequencymodulated Mølmer-Sørensen gates to motional mode frequency offsets by optimizing average performance over a range of systematic errors using batch optimization. We then compare this method to frequency modulated gates optimized for ideal parameters that include an analytic robustness condition. Numerical simulations show good performance up to 12 ions and the method is experimentally demonstrated on a two-ion chain.

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“…Trapped ions-a leading platform for quantum information [7][8][9][10][11][12][13][14][15], quantum simulation [16][17][18], and quantum metrology [19][20][21][22][23] -are a prime candidate for CVQC [24] and hybrid quantum computing [5,6,25]. The Jaynes-Cummings-type interaction between the (discrete) internal states of ions coupled to their (continuous) motional states can generate Gaussian [26][27][28] and non-Gaussian [29] operations.…”

Section: Introductionmentioning

confidence: 99%

Universal hybrid quantum computing in trapped ions

Sutherland,

Srinivas

2021

Preprint

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Using discrete and continuous variable subsystems, hybrid approaches to quantum information could enable more quantum computational power for the same physical resources. Here, we propose a hybrid scheme that can be used to generate the necessary Gaussian and non-Gaussian operations for universal continuous variable quantum computing in trapped ions. This scheme utilizes two linear spin-motion interactions to generate a broad set of non-linear effective spin-motion interactions including one and two mode squeezing, beam splitter, and trisqueezing operations in trapped ion systems. We discuss possible experimental implementations using laser-based and laser-free approaches.

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High-fidelity laser-free universal control of two trapped ion qubits

Cited by 8 publications

References 44 publications

A trapped ion quantum computer with robust entangling gates and quantum coherent feedback

A trapped ion quantum computer with robust entangling gates and quantum coherent feedback

Batch Optimization of Frequency-Modulated Pulses for Robust Two-qubit Gates in Ion Chains

Universal hybrid quantum computing in trapped ions

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