Scalable and Parallel Tweezer Gates for Quantum Computing with Long Ion Strings

Olsacher, Tobias; Postler, Lukas; Schindler, Philipp; Monz, Thomas; Zoller, P.; Sieberer, Lukas M.

doi:10.1103/prxquantum.1.020316

Cited by 44 publications

(23 citation statements)

References 79 publications

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“…Here, m i is the outcome of a measurement in the i th measurement, {m i } j is a combination of measurement outcomes (or measurement path) and p L ({m i }) j ) is the logical error probability for the resulting state after path j. Following this alternative, exhaustive sampling of all measurement outcomes, we can accurately estimate the logical error probability for a given crosstalk value using only 2 12 simulations, independently of the crosstalk error amplitude.…”

Section: B3 Leakage Repumping Errorsmentioning

confidence: 99%

“…In several qubit-based quantum processors [5], the implementation of some of the building blocks of QEC, such as the encoding of information in a QECC and the detection and correction of errors without altering the encoded information, has been demonstrated, for example, using trapped ions [6][7][8][9][10][11][12][13][14][15], superconducting circuits [16][17][18][19][20], nuclear magnetic resonance [21,22], or nitrogenvacancy centres [23,24]. Recently, and in parallel to these efforts, there has also been much progress in protecting quantum information in oscillatorbased bosonic QEC encodings (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions

Parrado-Rodríguez

Ryan-Anderson

Bermúdez

et al. 2021

Quantum

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Physical qubits in experimental quantum information processors are inevitably exposed to different sources of noise and imperfections, which lead to errors that typically accumulate hindering our ability to perform long computations reliably. Progress towards scalable and robust quantum computation relies on exploiting quantum error correction (QEC) to actively battle these undesired effects. In this work, we present a comprehensive study of crosstalk errors in a quantum-computing architecture based on a single string of ions confined by a radio-frequency trap, and manipulated by individually-addressed laser beams. This type of errors affects spectator qubits that, ideally, should remain unaltered during the application of single- and two-qubit quantum gates addressed at a different set of active qubits. We microscopically model crosstalk errors from first principles and present a detailed study showing the importance of using a coherent vs incoherent error modelling and, moreover, discuss strategies to actively suppress this crosstalk at the gate level. Finally, we study the impact of residual crosstalk errors on the performance of fault-tolerant QEC numerically, identifying the experimental target values that need to be achieved in near-term trapped-ion experiments to reach the break-even point for beneficial QEC with low-distance topological codes.

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Section: B3 Leakage Repumping Errorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions

Parrado-Rodríguez

Ryan-Anderson

Bermúdez

et al. 2021

Quantum

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“…Furthermore, the scheme may be extended to let the tweezers apply local stress or strain on the ion crystal modifying the equilibrium positions of the ions. Rapid dynamical control of the tweezers may open up new opportunities in trapped ion quantum information processing [37,40].…”

Section: Discussionmentioning

confidence: 99%

Engineering spin-spin interactions with optical tweezers in trapped ions

Espinoza,

Mazzanti,

Fouka

et al. 2021

Preprint

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We propose a new method for generating programmable interactions in one-and two-dimensional trapped-ion quantum simulators. Here we consider the use of optical tweezers to engineer the soundwave spectrum of trapped ion crystals. We show that this approach allows us to tune the interactions and connectivity of the ion qubits beyond the power-law interactions accessible in current setups. We demonstrate the experimental feasibility of our proposal using realistic tweezer settings and experimentally relevant trap parameters to generate the optimal tweezer patterns to create target spin-spin interaction patterns in both one-and two-dimensional crystals. Our approach will advance quantum simulation in trapped-ion platforms as it allows them to realize a broader family of quantum spin Hamiltonians.

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“…Our model can be applied to other atomic mixture systems to generate entanglement between two different atoms [65,66] and control the singlet-pairing process [67]. The calculated two-photon dynamic polarizability and magic wavelengths in this work would be useful for quantum computing with 137 Ba + ion strings where the interrogating laser lights are state-dependent [68]. F r e q u e n c y ( a .…”

Section: We Define ∆Ementioning

confidence: 99%

Two-photon polarizability of Ba$^+$ ion: Control of spin-mixing process in an ultracold $^{137}$Ba$^+$--$^{87}$Rb mixture

Das¹,

Bhowmik²,

Dutta³

et al. 2021

Preprint

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Ionic clocks exhibit one of the most promising candidates for the frequency standards. Recent investigations show the profound advantages of interrogating two laser lights with different frequencies in developing the frequency standards. Here, we present a scheme of a two-photon excitation process to calculate the dynamic polarizabilities of a few low-lying states of 137 Ba + by employing highly correlated relativistic many-body theory. We demonstrate the Stark shift cancellation for the clock states of 137 Ba + at the two-photon magic wavelengths, which would be an essential input to achieve better accuracy for the ionic clock experiments. We also calculate the magic wavelengths under the single-photon process to serve as the reference and for a comparative study. The calculated single-and two-photon magic wavelengths lie in the optical regime and are thus significant for future state-of-the-art experiments. Further, as an application, we investigate the impact of the two-photon polarizability on the spin-mixing process of an ultra-cold spin-1 mixture 137 Ba + − 87 Rb.We demonstrate the flexibility of the spin-exchange mechanism in the mixture in the presence of a tunable magnetic field and highlight the two-photon process-specific spin-oscillation protocol.

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Scalable and Parallel Tweezer Gates for Quantum Computing with Long Ion Strings

Cited by 44 publications

References 79 publications

Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions

Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions

Engineering spin-spin interactions with optical tweezers in trapped ions

Two-photon polarizability of Ba$^+$ ion: Control of spin-mixing process in an ultracold $^{137}$Ba$^+$--$^{87}$Rb mixture

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