Stable Turnkey Laser System for a Yb/Ba Trapped-Ion Quantum Computer

Chen, Tianyi; Kim, Junki; Kuzyk, Mark G.; Whitlow, Jacob; Phiri, Samuel; Bondurant, Brad; Riesebos, Leon; Brown, Kenneth R.; Kim, Jungsang

doi:10.1109/tqe.2022.3195428

Cited by 6 publications

(3 citation statements)

References 45 publications

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“…Quantum measurement is an important technology in quantum information science. [1][2][3][4] The bound of the detection accuracy is essentially due to Heisenberg uncertainty relationship. [5,6] Quantum parameter estimation can be used to find this limit in the precision of quantum measurement.…”

Section: Introductionmentioning

confidence: 99%

Quantum estimation of rotational speed in optomechanics

Cheng

2023

Chinese Phys. B

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In this paper, we study the quantum Fisher information (QFI) of the angular velocity of rotation in an optomechanical system. Based on the Gaussian measurements method, We derive the explicitly form of single-mode Gaussian QFI, which is valid for arbitrary angular velocity of rotation. The information about the angular velocity to be measured is all contained in the optical covariance matrix, which can be experimentally determined via homodyne measurement. We find that, QFI increases rapidly when diving the system close to the unstable boundary. This result can be attributed to the strong nonlinearity of the system at the unstable boundary. Our results indicates the possibility of using optomechanical system for high precision detection of the angular velocity of rotation.

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Section: Introductionmentioning

confidence: 99%

Quantum estimation of rotational speed in optomechanics

Cheng

2023

Chinese Phys. B

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“…Many schemes have been proposed to address this limit, which allows us to copy the original quantum information imperfectly, probabilistic [4][5][6][7][8] or with reduced fidelity by adding an auxiliary system [9][10][11][12][13][14][15]. And various physical systems have been studied to realize quantum cloning, including optical systems [13,[15][16][17][18], atomic systems [6,19], ion systems [20,21], superconducting system [22], and so on.…”

Section: Introductionmentioning

confidence: 99%

Photon-phonon quantum cloning in optomechanical system

Mu,

Wang,

Zhang

2023

Phys. Scr.

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Quantum cloning is an essential operation in quantum information and quantum computing. Similar to the ‘copy’ operation in classical computing, the cloning of flying bits for further processing from the solid-state quantum bits in storage is an operation frequently used in quantum information processing. Here we propose a high-fidelity and controllable quantum cloning scheme between solid bits and flying bits. In order to overcome the obstacles from the no-cloning theorem and the weak phonon-photon interaction, we introduce a hybrid optomechanical system that performs both the probabilistic cloning and deterministic cloning closed to the theoretical optimal limit with the help of designed driving pulse in the presence of dissipation. In addition, our scheme allows a highly tunable switching between two cloning methods, namely the probabilistic and deterministic cloning, by simply changing the input laser pulse. This provides a promising platform for experimental executability.

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“…Regarding experiment complexity, trapping a second species requires an additional set of laser sources, each of which must be focused onto the ion crystals. This greatly increases the density of optical elements, regardless of whether bulk optics or integrated optics are employed [19][20][21] . Lastly, transporting mixed-species crystals quickly 22 , or through trap junctions 23 , presents important challenges when compared to the single-species case.…”

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confidence: 99%

Rapid exchange cooling with trapped ions

Fallek,

Sandhu,

McGill

et al. 2024

Nat Commun

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The trapped-ion quantum charge-coupled device (QCCD) architecture is a leading candidate for advanced quantum information processing. In current QCCD implementations, imperfect ion transport and anomalous heating can excite ion motion during a calculation. To counteract this, intermediate cooling is necessary to maintain high-fidelity gate performance. Cooling the computational ions sympathetically with ions of another species, a commonly employed strategy, creates a significant runtime bottleneck. Here, we demonstrate a different approach we call exchange cooling. Unlike sympathetic cooling, exchange cooling does not require trapping two different atomic species. The protocol introduces a bank of “coolant" ions which are repeatedly laser cooled. A computational ion can then be cooled by transporting a coolant ion into its proximity. We test this concept experimentally with two 40Ca+ ions, executing the necessary transport in 107 μs, an order of magnitude faster than typical sympathetic cooling durations. We remove over 96%, and as many as 102(5) quanta, of axial motional energy from the computational ion. We verify that re-cooling the coolant ion does not decohere the computational ion. This approach validates the feasibility of a single-species QCCD processor, capable of fast quantum simulation and computation.

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Stable Turnkey Laser System for a Yb/Ba Trapped-Ion Quantum Computer

Cited by 6 publications

References 45 publications

Quantum estimation of rotational speed in optomechanics

Quantum estimation of rotational speed in optomechanics

Photon-phonon quantum cloning in optomechanical system

Rapid exchange cooling with trapped ions

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