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Generation of long-living entanglement using cold trapped ions with pair cat states

Mahmoud Abdel‐Aty

arXiv:quant-ph/0603249Applied Physics BJun 22, 20068 citations

Sudden death and long-lived entanglement of two trapped ions

Mahmoud Abdel‐Aty, H. M. Moya-Cessa

arXiv:quant-ph/0703077Physics Letters AMay 9, 200741 citations

Demonstration of a simplified protocol for dissipative entanglement of two trapped-ion qubits

Daniel C. Cole, Stephen D. Erickson, Pan‐Yu Hou +6 more

Bulletin of the American Physical SocietyJun 4, 20210 citations

Non-thermalization in trapped atomic ion spin chains

P. W. Hess, P. Becker, H. B. Kaplan +10 more

Linear arrays of trapped and laser-cooled atomic ions are a versatile platform for studying strongly interacting many-body quantum systems. Effective spins are encoded in long-lived electronic levels of each ion and made to interact through laser-mediated optical dipole forces. The advantages of experiments with cold trapped ions, including high spatio-temporal resolution, decoupling from the external environment and control over the system Hamiltonian, are used to measure quantum effects not always accessible in natural condensed matter samples. In this review, we highlight recent work using trapped ions to explore a variety of non-ergodic phenomena in long-range interacting spin models, effects that are heralded by the memory of out-of-equilibrium initial conditions. We observe long-lived memory in static magnetizations for quenched many-body localization and prethermalization, while memory is preserved in the periodic oscillations of a driven discrete time crystal state.This article is part of the themed issue 'Breakdown of ergodicity in quantum systems: from solids to synthetic matter'.Linear arrays of trapped and laser-cooled atomic ions are a versatile platform for studying strongly interacting many-body quantum systems. Effective spins are encoded in long-lived electronic levels of each ion and made to interact through laser-mediated optical dipole forces. The advantages of experiments with cold trapped ions, including high spatio-temporal resolution, decoupling from the external environment and control over the system Hamiltonian, are used to measure quantum effects not always accessible in natural condensed matter samples. In this review, we highlight recent work using trapped ions to explore a variety of non-ergodic phenomena in long-range interacting spin models, effects that are heralded by the memory of out-of-equilibrium initial conditions. We observe long-lived memory in static magnetizations for quenched many-body localization and prethermalization, while memory is preserved in the periodic oscillations of a driven discrete time crystal state.This article is part of the themed issue 'Breakdown of ergodicity in quantum systems: from solids to synthetic matter'.

arXiv:1704.02439Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering SciencesOct 30, 201737 citations

Robust Quantum Memory in a Trapped-Ion Quantum Network Node

P. Drmota, D. Main, D. P. Nadlinger +8 more

We integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network node. Ion-photon entanglement first generated with a network qubit in ^{88}Sr^{+} is transferred to ^{43}Ca^{+} with 0.977(7) fidelity, and mapped to a robust memory qubit. We then entangle the network qubit with a second photon, without affecting the memory qubit. We perform quantum state tomography to show that the fidelity of ion-photon entanglement decays ∼70 times slower on the memory qubit. Dynamical decoupling further extends the storage duration; we measure an ion-photon entanglement fidelity of 0.81(4) after 10 s.We integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network node. Ion-photon entanglement first generated with a network qubit in ^{88}Sr^{+} is transferred to ^{43}Ca^{+} with 0.977(7) fidelity, and mapped to a robust memory qubit. We then entangle the network qubit with a second photon, without affecting the memory qubit. We perform quantum state tomography to show that the fidelity of ion-photon entanglement decays ∼70 times slower on the memory qubit. Dynamical decoupling further extends the storage duration; we measure an ion-photon entanglement fidelity of 0.81(4) after 10 s.

arXiv:2210.11447Physical Review LettersMar 3, 202382 citations

Ultrafast entanglement of trapped ions

Brian Neyenhuis, Jonathan Mizrahi, K. G. Johnson +1 more

Bulletin of the American Physical SocietyJun 6, 20130 citations

Observation of very long-lived entanglement

Abstract

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Observation of very long-lived entanglement

Abstract

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