Rydberg antiblockade regimes: Dynamics and applications

Su, Shi‐Lei; Guo, F.-Q.; Wu, Jin‐Lei; Jin, Zhao; Shao, Xiao‐Qiang; Zhang, S.

doi:10.1209/0295-5075/131/53001

Cited by 32 publications

(18 citation statements)

References 71 publications

(129 reference statements)

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“…It is also of interest to extend our theories to Rydberg gates by the antiblockade method [126,127] as reviewed in Ref. [128]. Although the antiblockade regime is sensitive to the fluctuation of the Rydberg interactions, the simultaneous excitation of both qubit states to Rydberg state, as shown in Theory 1, can be useful for designing exotic logic gates [98].…”

Section: Discussionmentioning

confidence: 98%

Rydberg quantum computation with nuclear spins in two-electron neutral atoms

Shi

2021

Preprint

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Alkaline-earth-like (AEL) atoms with two valence electrons and a nonzero nuclear spin can be excited to Rydberg state for quantum computing. Typical AEL ground states possess no hyperfine splitting, but unfortunately a GHz-scale splitting seems necessary for Rydberg excitation. Though strong magnetic fields can induce a GHz-scale splitting, weak fields are desirable to avoid noise in experiments. Here, we provide two solutions to this outstanding challenge with realistic data of wellstudied AEL isotopes. In the first theory, the two nuclear spin qubit states |0 and |1 are excited to Rydberg states |r with detuning ∆ and 0, respectively, where a MHz-scale detuning ∆ arises from a weak magnetic field on the order of 1 G. With a proper ratio between ∆ and Ω, the qubit state |1 can be fully excited to the Rydberg state while |0 remains there. In the second theory, we show that by choosing appropriate intermediate states a two-photon Rydberg excitation can proceed with only one nuclear spin qubit state. The second theory is applicable whatever the magnitude of the magnetic field is. These theories bring a versatile means for quantum computation by combining the broad applicability of Rydberg blockade and the incomparable advantages of nuclear-spin quantum memory in two-electron neutral atoms.

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Section: Discussionmentioning

confidence: 98%

Rydberg quantum computation with nuclear spins in two-electron neutral atoms

Shi

2021

Preprint

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“…In the following we would show how to achieve the RAB even when V d Ω. When the RRI strength is much stronger than Rabi frequency, the aim is to use the laser detuning to compensate the energy shift induced by the RRI [85]. And it is precisely from this point that one always rotates the whole Hamiltonian with respect to the RRI-related Hamiltonian, which is convenient to get the relation between laser detuning and RRI strength since V d is also moved to the exponential part (i.e.…”

Section: Effective Hamiltonianmentioning

confidence: 99%

“…And it is precisely from this point that one always rotates the whole Hamiltonian with respect to the RRI-related Hamiltonian, which is convenient to get the relation between laser detuning and RRI strength since V d is also moved to the exponential part (i.e. contributing to the phase) [85,86]. With this at hand, one can employ the second-order perturbation theory to obtain the RAB condition.…”

Section: Effective Hamiltonianmentioning

confidence: 99%

Dipole-dipole-interaction–driven antiblockade of two Rydberg atoms

2021

Phys. Rev. A

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Resonant laser excitation of multiple Rydberg atoms are prohibited, leading to Rydberg blockade, when the long-range van der Waals interactions are stronger than the laser-atom coupling. Rydberg blockade can be violated, i.e. simultaneous excitation of more than one Rydberg atoms, by off-resonant laser excitation, causing an excitation antiblockade. Rydberg antiblockade gives rise to strongly correlated many-body dynamics and spin-orbit coupling, and also finds quantum computation applications. Instead of commonly used van der Waals interactions, we investigate antiblockade dynamics of two Rydberg atoms interacting via dipole-dipole exchange interactions. We study typical situations in current Rydberg atoms experiments, where different types of dipole-dipole interactions can be achieved by varying Rydberg state couplings. Effective Hamiltonian governing underlying antiblockade dynamics is derived. We illustrate that geometric gates can be realized with the Rydberg antiblockade which is robust against decay of Rydberg states. Our study may stimulate new experimental and theoretical exploration of quantum optics and strongly interacting many-body dynamics with Rydberg antiblockade driven by dipole-dipole interactions.

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“…Currently, ultracold Rydberg atoms are emerging as a promising platform for probing quantum many-body phenomena and implementing quantum information protocols [34,35]. The Rydberg blockade, in which strong Rydberg-Rydberg interactions (RRIs) suppress simultaneous excitation of two Rydberg atoms within a finite volume [36][37][38][39], and the breaking of the blockade (anti-blockade) [40][41][42][43] are of central utility for these applications. For two atoms, it has been predicted that through modulation induced resonances, one can engineer the parameter space for both Rydberg-blockade and anti-blockade [44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Population trapping in a pair of periodically driven Rydberg atoms

Mallavarapu

Niranjan

et al. 2021

Phys. Rev. A

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We study the population trapping extensively in a periodically driven Rydberg pair. The periodic modulation of the atom-light detuning effectively suppresses the Rabi couplings and, together with Rydberg-Rydberg interactions, leads to the state-dependent population trapping. We identify a simple yet a general scheme to determine population trapping regions using driving induced resonances, the Floquet spectrum, and the inverse participation ratio. Contrary to the single atom case, we show that the population trapping in the two-atom setup may not necessarily be associated with level crossings in the Floquet spectrum. Further, we discuss under what criteria population trapping can be related to dynamical stabilization, taking specific and experimentally relevant initial states, which include both product and the maximally entangled Bell states. The behavior of the entangled states is further characterized by the bipartite entanglement entropy.

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Rydberg antiblockade regimes: Dynamics and applications

Cited by 32 publications

References 71 publications

Rydberg quantum computation with nuclear spins in two-electron neutral atoms

Rydberg quantum computation with nuclear spins in two-electron neutral atoms

Dipole-dipole-interaction–driven antiblockade of two Rydberg atoms

Population trapping in a pair of periodically driven Rydberg atoms

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