High-Fidelity Bell-State Preparation with 
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 Optical Qubits

Clark, Craig Robert; Tinkey, Holly; Sawyer, Brian C.; Meier, Adam; Burkhardt, Karl A.; Seck, Christopher M.; Shappert, Christopher M.; Guise, Nicholas D.; Volin, Curtis; Fallek, Spencer D.; Hayden, Harley; Rellergert, Wade G.; Brown, Kenneth R.

doi:10.1103/physrevlett.127.130505

Cited by 98 publications

(49 citation statements)

References 26 publications

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“…From the 3-mode BSB time scan measurement in Fig. (4) we can extract the diagonal terms in the prepared Wstate density matrix, however the measurement does not inform knowledge of off-diagonal terms which describes the entanglement of W-state. Reconstructing the whole density matrix of W-state can extract the entanglement, which requires long measurement process and can be affected by show drift in calibrations.…”

Section: Verifying W-state Entanglementmentioning

confidence: 99%

“…Introduction.-Trapped atomic ion systems are a flexible platform for quantum simulations. High-fidelity single-qubit rotations and two-qubit entangling gates have been realized in trapped ion systems [1][2][3][4][5][6], enabling spin-based digital quantum simulations [7][8][9][10][11]. Apart from digital simulations, the Jaynes-Cummings type interactions between ion spins and motional phonons of the harmonic potential offer a natural platform for analog quantum simulations of spin-boson coupling [12][13][14][15][16][17][18].…”

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confidence: 99%

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Determination of Multi-mode Motional Quantum States in a Trapped Ion System

Jia,

Wang,

Zhang

et al. 2022

Preprint

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Trapped atomic ions are a versatile platform for studying interactions between spins and bosons by coupling the internal states of the ions to their motion. Measurement of complex motional states with multiple modes is challenging, because all motional state populations can only be measured indirectly through the spin state of ions. Here we present a general method to determine the Fock state distributions and to reconstruct the density matrix of an arbitrary multi-mode motional state. We experimentally verify the method using different entangled states of multiple radial modes in a 5-ion chain. This method can be extended to any system with Jaynes-Cummings type interactions.

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Section: Verifying W-state Entanglementmentioning

confidence: 99%

mentioning

confidence: 99%

Determination of Multi-mode Motional Quantum States in a Trapped Ion System

Jia,

Wang,

Zhang

et al. 2022

Preprint

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“…Trapped ions have been one of the leading candidates for precision and metrology research due to their high degree of isolation from the surrounding perturbations [1,2]. More recently, the development of entangling operations in qubits encoded in trapped ions [3][4][5] has led to high fidelity quantum computation and simulations [6][7][8] In order to fully utilize the power of quantum computation and simulations, one needs quantum systems comprised of a large number of (quantum-error corrected) qubits. There has been a strong push to scale up the number of trapped ions by designing specific trap geometries for shuttling and reconfiguring ion crystals [9,10] or arrays of ion traps [11,12], and by potentially connecting them via quantum networks [13].…”

Section: Introductionmentioning

confidence: 99%

Controlling long ion strings for quantum simulation and precision measurements

Kranzl,

Joshi,

Maier

et al. 2021

Preprint

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Scaling a trapped-ion based quantum simulator to a large number of ions creates a fullycontrollable quantum system that becomes inaccessible to numerical methods. When highly anisotropic trapping potentials are used to confine the ions in the form of a long linear string, several challenges have to be overcome to achieve high-fidelity coherent control of a quantum system extending over hundreds of micrometers. In this paper, we describe a setup for carrying out many-ion quantum simulations including single-ion coherent control that we use for demonstrating entanglement in 50-ion strings. Furthermore, we present a set of experimental techniques probing ion-qubits by Ramsey and Carr-Purcell-Meiboom-Gill (CPMG) pulse sequences that enable detection (and compensation) of power-line-synchronous magnetic-field variations, measurement of path length fluctuations, and of the wavefronts of elliptical laser beams coupling to the ion string.

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“…The development of well-controlled, scalable qubit architectures is central to quantum science, and has seen rapid advances across a number of physical platforms [1][2][3][4][5][6][7][8][9]. In this direction, neutral-atom qubits stored in optical arrays have made substantial progress in recent years [4,5,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Ytterbium nuclear-spin qubits in an optical tweezer array

Jenkins,

Lis,

Senoo

et al. 2021

Preprint

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We report on the realization of a fast, scalable, and high-fidelity qubit architecture, based on 171 Yb atoms in an optical tweezer array. We demonstrate several attractive properties of this atom for its use as a building block of a quantum information processing platform. Its nuclear spin of 1/2 serves as a long-lived, coherent, two-level system, while its rich, alkaline-earth-like electronic structure allows for low entropy preparation, fast qubit control, and high fidelity readout. Using narrowline transitions, we present a near-deterministic loading protocol, which allows us to fill a 10×10 tweezer array with 92.73(8)% efficiency and a single tweezer with 96.0(1.4)% efficiency. Employing a robust optical approach, we perform sub-microsecond qubit rotations and characterize their fidelity through randomized benchmarking, yielding 5.2(5)×10 −3 error per Clifford gate. For quantum memory applications, we measure the coherence of our qubits with T * 2 =3.7(4) s and T2=8.1(7) s. Finally, we use 3D Raman sideband cooling to bring the atoms near their motional ground state, which will be central to future implementations of two-qubit gates that benefit from low motional entropy.

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High-Fidelity Bell-State Preparation with Ca+40 Optical Qubits

Cited by 98 publications

References 26 publications

Determination of Multi-mode Motional Quantum States in a Trapped Ion System

Determination of Multi-mode Motional Quantum States in a Trapped Ion System

Controlling long ion strings for quantum simulation and precision measurements

Ytterbium nuclear-spin qubits in an optical tweezer array

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