High-fidelity entanglement of neutral atoms via a Rydberg-mediated single-modulated-pulse controlled-phase gate

Fu, Zhuo; Xu, Peng; Sun, Yuan; Liu, Yangyang; He, Xiaodong; Li, Xiao; Liu, Min; Li, Runbing; Wang, Jin; Liu, Liang; Zhan, Min

doi:10.1103/physreva.105.042430

Cited by 43 publications

(29 citation statements)

References 42 publications

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“…Our pulse is also more than three times faster than the pulse found in Ref. [24] by optimizing the amplitude of Ω while assuming a fixed laser detuning. We attribute this to our approach of including the laser phase in the optimization, and to our use of the simplest possible model of the system, which allows to identify the fundamentally time-optimal pulse regardless of experimental imperfections.…”

Section: Global Cz Gatementioning

confidence: 84%

“…In the original scheme [18], the accumulation of relevant phase shifts in two-qubit quantum gates is facilitated by the so-called "Rydberg blockade" mechanism, whereby one laser-excited atom shifts the Rydberg states of neighboring atoms out of resonance due to strong Rydberg-Rydberg interactions -a process that can be readily generalized to k-qubit gates, in principle [19,20]. Two-qubit entangling gates have been implemented in several experiments [21][22][23][24][25][26], achieving fidelities up to 99.1%. [26].…”

Section: Introductionmentioning

confidence: 99%

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Time-Optimal Two- and Three-Qubit Gates for Rydberg Atoms

Jandura

Pupillo

2022

Quantum

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We identify time-optimal laser pulses to implement the controlled-Z gate and its three qubit generalization, the C2Z gate, for Rydberg atoms in the blockade regime. Pulses are optimized using a combination of numerical and semi-analytical quantum optimal control techniques that result in smooth Ansätze with just a few variational parameters. For the CZ gate, the time-optimal implementation corresponds to a global laser pulse that does not require single site addressability of the atoms, simplifying experimental implementation of the gate. We employ quantum optimal control techniques to mitigate errors arising due to the finite lifetime of Rydberg states and finite blockade strengths, while several other types of errors affecting the gates are directly mitigated by the short gate duration. For the considered error sources, we achieve theoretical gate fidelities compatible with error correction using reasonable experimental parameters for CZ and C2Z gates.

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Section: Global Cz Gatementioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Time-Optimal Two- and Three-Qubit Gates for Rydberg Atoms

Jandura

Pupillo

2022

Quantum

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“…A single-step implementation of the three-qubit controlled gates with Rydberg atoms was reported [22]. Also, the realization of a two-qubit controlled-PHASE (C Z ) gate via single-modulated-pulse off-resonant modulated driving embedded in a two-photon transition for Rb atoms with high-fidelity entanglement to be 0.980 (7) was recently reported [23].…”

Section: Introductionmentioning

confidence: 99%

Parallel implementation of CNOT$^{\text{N}}$ and C$_2$NOT$^2$ gates via homonuclear and heteronuclear Förster interactions of Rydberg atoms

Farouk¹,

Beterov²,

Xu³

et al. 2022

Preprint

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“…Arrays of Rydberg atoms in optical tweezers are one of the most exciting systems for quantum simulation [24][25][26][27] and computation [28][29][30][31][32] . At its core, the dipole-dipole interaction Ĥdip ≈ d1 d2 /4πϵ 0 R 3 (refs.…”

mentioning

confidence: 99%

“…1a). The best entangling protocols of Rydberg atoms [28][29][30][31] are currently performed deeply in the adiabatic regime compared with the available interaction strength, with a typical duration of 0.5 μs, as they rely on Rydberg blockade 35 . In this scenario, the interaction strength-either the dipole-dipole coupling, J, or more often the weaker second-order van der Waals shift, V-is larger than the coupling Ω CW from ground to Rydberg states with continuous-wave (CW) lasers, such that excitation of two atoms is prohibited.…”

mentioning

confidence: 99%

Ultrafast energy exchange between two single Rydberg atoms on a nanosecond timescale

et al. 2022

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Rydberg atoms, with their enormous electronic orbitals, exhibit dipole–dipole interactions reaching the gigahertz range at a distance of a micrometre, making them a prominent contender for realizing ultrafast quantum operations. However, such strong interactions between two single atoms have so far never been harnessed due to the stringent requirements on the fluctuation of the atom positions and the necessary excitation strength. Here we introduce novel techniques to explore this regime. First, we trap and cool atoms to the motional quantum ground state of holographic optical tweezers, which allows control of the inter-atomic distance down to 1.5 μm with a quantum-limited precision of 30 nm. We then use ultrashort laser pulses to excite a pair of these nearby atoms to a Rydberg state simultaneously, far beyond the Rydberg blockade regime, and perform Ramsey interferometry with attosecond precision. This allows us to induce and track an ultrafast interaction-driven energy exchange completed on nanosecond timescales—two orders of magnitude faster than in any other Rydberg experiments in the tweezers platform so far. This ultrafast coherent dynamics gives rise to a conditional phase, which is the key resource for a quantum gate, opening the path for quantum simulation and computation operating at the speed limit set by dipole–dipole interactions with this ultrafast Rydberg platform.

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High-fidelity entanglement of neutral atoms via a Rydberg-mediated single-modulated-pulse controlled-phase gate

Cited by 43 publications

References 42 publications

Time-Optimal Two- and Three-Qubit Gates for Rydberg Atoms

Time-Optimal Two- and Three-Qubit Gates for Rydberg Atoms

Parallel implementation of CNOT$^{\text{N}}$ and C$_2$NOT$^2$ gates via homonuclear and heteronuclear Förster interactions of Rydberg atoms

Ultrafast energy exchange between two single Rydberg atoms on a nanosecond timescale

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