Dynamics of low-density ultracold Rydberg gases

Day, J. O.; Brekke, Erik; Walker, Thad

doi:10.1103/physreva.77.052712

Cited by 47 publications

(55 citation statements)

References 44 publications

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“…We assume that each atom emits into different electromagnetic modes, i.e., the decay is not superradiant. (This approximation is appropriate for relatively small N , but for large N , superradiant decay to neighboring Rydberg states dominates [21,34,35]). …”

Section: Modelmentioning

confidence: 99%

Spatial correlations of one-dimensional driven-dissipative systems of Rydberg atoms

Lee

Clark

2013

Phys. Rev. A

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We consider a one-dimensional lattice of atoms with laser excitation to a Rydberg state and spontaneous emission. The atoms are coupled due to the dipole-dipole interaction of the Rydberg states. This driven-dissipative system has a broad range of non-equilibrium phases, such as antiferromagnetic ordering and bistability. Using the quantum trajectory method, we calculate the spatial correlation function throughout the parameter space for up to 20 lattice sites. We show that bistability significantly strengthens the spatial correlations and the entanglement.

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Section: Modelmentioning

confidence: 99%

Spatial correlations of one-dimensional driven-dissipative systems of Rydberg atoms

Lee

Clark

2013

Phys. Rev. A

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“…Exact values of these rates are given in Ref. [66]. The atomic collision rate inside atomic vapor is given by τ…”

Section: Generation Of the Ghz And Cluster Statesmentioning

confidence: 99%

“…The probability of an absorption of a single photon by a cigar shaped atomic en-semble is given by P abs ∼ = 1 − e −N i σ 0 /A , with N i = N the number of atoms in the interaction region, σ 0 = 3λ 2 γ 0 /(2πγ) is the on-resonance scattering cross section of a single-photon pulse, where γ 0 is the spontaneous decay rate of the Rydberg state to low-lying levels and γ is the spontaneous decay to other Rydberg states. [2,66,79] A = πw 2 0 is the area of a single-photon pulse with a waist w 0 ≈ πλ. [80] With λ 43D = 485.766 nm, γ 0 = 1.1 10 4 Hz and γ = 7.2 10 4 Hz, the probability of an absorption for 43D 5/2 state is P abs ∼ = 0.69.…”

Section: Generation Of the Ghz And Cluster Statesmentioning

confidence: 99%

“…The spontaneous emission from the Rydberg state and the black-body transfer (to other Rydberg states) occur with low rates of order 10 3 Hz (or even 10 2 Hz for higher Rydberg states) and may introduce small error P decay ∼ = 1 − exp(−10 3 t) = 0.01. [66] Other sources of errors such as atomic collisions and Doppler broadening are negligible because of a low temperature of the atomic vapor.…”

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confidence: 99%

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Applications of Atomic Ensembles in Distributed Quantum Computing

Zwierz

Kok

2010

Int. J. Quantum Inform.

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Thesis chapter. The fragility of quantum information is a fundamental constraint faced by anyone trying to build a quantum computer. A truly useful and powerful quantum computer has to be a robust and scalable machine. In the case of many qubits which may interact with environment and their neighbors, protection against decoherence becomes quite a challenging task. The scalability and decoherence issues are the main difficulties addressed by the distributed model of quantum computation. A distributed quantum computer consists of a large quantum network of distant nodes -stationary qubits which communicate via flying qubits. Quantum information can be transferred, stored, processed and retrieved in decoherence-free fashion by nodes of a quantum network realized by an atomic mediuman atomic quantum memory. Atomic quantum memories have been developed and demonstrated experimentally in recent years. With a help of linear optics and laser pulses one is able to manipulate quantum information stored inside an atomic quantum memory by means of electromagnetically induced transparency and associated propagation phenomena. Any quantum computation or communication necessarily involves entanglement. Therefore, one must be able to entangle distant nodes of a distributed network. In this article, we focus on the probabilistic entanglement generation procedures such as well-known DLCZ protocol. We also demonstrate theoretically a scheme based on atomic ensembles and the dipole blockade mechanism for generation of inherently distributed quantum states so-called cluster states. In 1 the protocol, atomic ensembles serve as single qubit systems. Hence, we review single-qubit operations on qubit defined as collective states of atomic ensemble. Our entangling protocol requires nearly identical single-photon sources, one ultra-cold ensemble per physical qubit, and regular photodetectors. The general entangling procedure is presented, as well as a procedure that generates in a single step Q-qubit GHZ states with success probability p success ∼ η Q/2 , where η is the combined detection and source efficiency. This is significantly more efficient than any known robust probabilistic entangling operation. The GHZ states form the basic building block for universal cluster states, a resource for the one-way quantum computer.

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“…Population dynamics in weakly excited clouds of cold Rydberg atoms has attracted a lot recent research interests [40,42].…”

Section: Introductionmentioning

confidence: 99%

Interaction of a Laguerre–Gaussian beam with trapped Rydberg atoms

Mukherjee

Majumder

Mondal³

et al. 2017

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

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Transfer mechanism of orbital angular moment(OAM) of light to trapped ground-state atoms under paraxial approximation is well known. Here we show how optical OAM of a LaguerreGaussian(LG) beam under paraxial approximation can be transferred to trapped Rydberg atoms.Optical OAM is shown to be transferable to a Rydberg electronic state in dipole transition. The Gaussian part of the profile of the LG beam, which is generally neglected , is found to have an important effect on the OAM transfer to the Rydberg atoms. Numerical calculations are calculated based on this theory for Rubidium Rydberg atoms trapped in a harmonic potential. Our results exhibit the mixing of final states of different parities. * sonjoym@phy.iitkgp.ernet.in

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Dynamics of low-density ultracold Rydberg gases

Cited by 47 publications

References 44 publications

Spatial correlations of one-dimensional driven-dissipative systems of Rydberg atoms

Spatial correlations of one-dimensional driven-dissipative systems of Rydberg atoms

Applications of Atomic Ensembles in Distributed Quantum Computing

Interaction of a Laguerre–Gaussian beam with trapped Rydberg atoms

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