Source of entangled atom pairs on demand using the Rydberg blockade

Wüster, Sebastian; Möbius, S.; Genkin, Michael; Eisfeld, Alexander; Rost, Jan M.

doi:10.1103/physreva.88.063644

Cited by 12 publications

(16 citation statements)

References 68 publications

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“…Similar decoherence effects in chemistry might arise for large bond lengths with atypically dense solvents. Our results also open up a research arena on the influence of tunable decoherence on energy transport and atomic motional dynamics in flexible Rydberg aggregates [14,15,[57][58][59] embedded in host atom clouds [67,68]. Additionally, we have shown how temporally localized decoherence pulses can be used as an incoherent means of population redistribution among BO surfaces.…”

mentioning

confidence: 55%

Quantum Zeno Suppression of Intramolecular Forces

Wüster

2017

Phys. Rev. Lett.

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We show that Born-Oppenheimer surfaces can intrinsically decohere, implying loss of coherence among constituent electronic basis states. We consider the example of interatomic forces due to resonant dipoledipole interactions within a dimer of highly excited Rydberg atoms, embedded in an ultracold gas. These forces rely on a coherent superposition of two-atom electronic states, which is destroyed by continuous monitoring of the dimer state through a detection scheme utilizing the background gas atoms. We show that this intrinsic decoherence of the molecular energy surface can gradually deteriorate a repulsive dimer state, causing a mixing of attractive and repulsive character. For sufficiently strong decoherence, a Zeno-like effect causes a complete cessation of interatomic forces. We finally show how short decohering pulses can controllably redistribute population between the different molecular energy surfaces.

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confidence: 55%

Quantum Zeno Suppression of Intramolecular Forces

Wüster

2017

Phys. Rev. Lett.

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“…One way to improve the fidelity of our scheme is searching for suitable Rydberg states with longer lifetime. As in Rost's work [18], a higher fidelity is obtained in the timescale of a few µs with strong and short pulses; however it does not work here because we need to follow the evolution of a quasi-dark eigenstate that means a longer pulse duration will lead to better adiabaticity. So the decay rates of intermediate states must be an obstacle for the performance of the scheme.…”

Section: Fidelity Of Adiabatic Passagementioning

confidence: 96%

“…Note that ω ≫ Ω max (the peak value of Ω(t)) is always kept. Comparing to [18] where the required shapes of microwave and detuning pulses are relatively complicated, the pulses needed in our scheme are more flexible that only should satisfy the adiabatic evolution of |λ a 0 (t) . Based on the analytical expressions of eigenvalues |λ a 0 (t) and |λ a 1 (t) [see Eqs.…”

Section: Chirped Adiabatic Passagementioning

confidence: 99%

Deterministic entanglement generation between a pair of atoms on different Rydberg states via chirped adiabatic passage

Qian¹,

Zhang²

2017

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. We develop a scheme for deterministic generation of an entangled state between two atoms on different Rydberg states via a chirped adiabatic passage, which directly connects the initial ground and target entangled states and also does not request the normally needed blockade effect. The occupancy of intermediate states suffers from a strong reduction via two pulses with proper time-dependent detunings and the electromagnetically induced transparency condition. By solving the analytical expressions of eigenvalues and eigenstates of a two-atom system, we investigate the optimal parameters for guaranteeing the adiabatic condition. We present a detailed study for the effect of pulse duration, changing rate, different Rydberg interactions on the fidelity of the prepared entangled state with experimentally feasible parameters, which reveals a good agreement between the analytic and full numerical results.

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“…Further analysis reveals that the underlying exciton state | ϕ rep (R) is adiabatically preserved due to the relatively slow motion R(t) of the atoms. In this scenario, the coherent excitation transport also implies entanglement transport, which could be measured through Belltype inequalities [109]. An additional combination of repulsive van-der-Waals and attractive dipole-dipole interactions can modify exciton states at short distances and form aggregates of actually up to 6 atoms bound in one dimension, enabling studies of their dissociation [43].…”

Section: Adiabatic Excitation Transportmentioning

confidence: 99%

Rydberg aggregates

Wüster

Rost

2018

J. Phys. B: At. Mol. Opt. Phys.

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We review Rydberg aggregates, assemblies of a few Rydberg atoms exhibiting energy transport through collective eigenstates, considering isolated atoms or assemblies embedded within clouds of cold ground-state atoms. We classify Rydberg aggregates, and provide an overview of their possible applications as quantum simulators for phenomena from chemical or biological physics. Our main focus is on flexible Rydberg aggregates, in which atomic motion is an essential feature. In these, simultaneous control over Rydberg-Rydberg interactions, external trapping and electronic energies, allows Born-Oppenheimer surfaces for the motion of the entire aggregate to be taylored as desired. This is illustrated with theory proposals towards the demonstration of joint motion and excitation transport, conical intersections and non-adiabatic effects. Additional flexibility for quantum simulations is enabled by the use of dressed dipole-dipole interactions or the embedding of the aggregate in a cold gas or BEC environment. Finally we provide some guidance regarding the parameter regimes that are most suitable for the realization of either static or flexible Rydberg aggregates based on Li or Rb atoms. The current status of experimental progress towards enabling Rydberg aggregates is also reviewed.

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Source of entangled atom pairs on demand using the Rydberg blockade

Cited by 12 publications

References 68 publications

Quantum Zeno Suppression of Intramolecular Forces

Quantum Zeno Suppression of Intramolecular Forces

Deterministic entanglement generation between a pair of atoms on different Rydberg states via chirped adiabatic passage

Rydberg aggregates

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