Collisional and thermal ionization of sodium Rydberg atoms: I. Experiment fornS andnD atoms withn= 8–20

Ryabtsev, I. I.; Tretyakov, D. B.; Бетеров, И. И.; Безуглов, Н. Н.; Miculis, K.; Экерс, А.

doi:10.1088/0953-4075/38/2/002

Cited by 24 publications

(49 citation statements)

References 36 publications

(100 reference statements)

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“…The amplitudes E of the extracting electric field pulse are chosen as 100 and 200 V/cm (corresponding to n c = 42 and 36, respectively). These values are close to those used in our recent atomic-beam experiment on ionization of Na atoms [11]. Alternatively, Figs.…”

Section: Field Ionization Of High Rydberg States Populated By Bbrsupporting

confidence: 90%

“…Hence, BBR-induced population transfer to n ′ P state can noticeably affect the measured effective BBR ionization rate. The rates of spontaneous and BBRinduced transitions from the initial 16S and 16D states to a number of n ′ P states have been calculated by us in [11] and are shown in Figs. 1(b) and 1(c).…”

Section: B Bbr-induced Mixing Of Rydberg Statesmentioning

confidence: 99%

“…4. Such scheme was used in our recent experiment on collisional ionization of Na Rydberg atoms [11]. The first electric-field pulse is applied immediately after the laser excitation pulse in order to remove the atomic A + and molecular A + 2 photoions produced by the laser pulse.…”

Section: Ionization Of Rydberg States Populated By Bbrmentioning

confidence: 99%

“…A simple scaling law for BBR ionization rates was also introduced in that work. More recently, the interest to BBR-induced ionization of Rydberg atoms has been related to the spontaneous formation of ultracold plasma in dense samples of cold Rydberg atoms [9,10], and to the prospects of its use as a convenient reference signal in absolute measurements of collisional ionization rates [11]. Even nowadays, however, the studies of spontaneous evolution of ultracold Rydberg atoms to a plasma caused by BBR [9,10] use the simple estimates of BBR ionization rates taken from the well-known work [2].…”

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confidence: 99%

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Ionization of sodium and rubidiumnS,nP, andnDRydberg atoms by blackbody radiation

et al. 2007

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Results of theoretical calculations of ionization rates of Rb and Na Rydberg atoms by blackbody radiation (BBR) are presented. Calculations have been performed for nS, nP and nD states of Na and Rb, which are commonly used in a variety of experiments, at principal quantum numbers n=8-65 and at three ambient temperatures of 77, 300 and 600 K. A peculiarity of our calculations is that we take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of measured ionization rates and shapes of their dependences on n. The calculated ionization rates are compared with the results of our earlier measurements of BBR-induced ionization rates of Na nS and nD Rydberg states with n=8-20 at 300 K. A good agreement for all states except nS with n > 15 is observed. We also present the useful analytical formulae for quick estimation of BBR ionization rates of Rydberg atoms.

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Section: Field Ionization Of High Rydberg States Populated By Bbrsupporting

confidence: 90%

Section: B Bbr-induced Mixing Of Rydberg Statesmentioning

confidence: 99%

Section: Ionization Of Rydberg States Populated By Bbrmentioning

confidence: 99%

mentioning

confidence: 99%

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Ionization of sodium and rubidiumnS,nP, andnDRydberg atoms by blackbody radiation

et al. 2007

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“…Exploring and improving the new calculation possibilities and simulation techniques, attracted extensive attention in the chemi-ionization and (n-n')-mixing processes in atom Rydberg atom collisions, which resulted in numerous papers dedicated to this problem in various research fields like astrophysics, plasma physics, chemistry (see for example Bohr et al (2012); Barklem (2007); Mihajlov et al (2007a); Ryabtsev et al (2005)). …”

Section: Introductionmentioning

confidence: 99%

Non-Elastic Processes in Atom Rydberg-Atom Collisions: Review of State of Art and Problems

et al. 2015

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In our previous research, it has been demonstrated that such inelastic processes in atom Rydbergatom collisions, as chemi-ionization and (n-n') mixing, should be considered together. Here we will review the present state of the art and the actual problems will be discussed. In this context, we will consider the influence of the (n-n')-mixing during a symmetric atom Rydberg-atom collision processes on the intensity of chemi-ionization process. It will be taken into account H(1s) + H*(n) collisional systems, where the principal quantum number n >> 1. It will be demonstrated that the inclusion of (nn') mixing in the calculation, influences significantly on the values of chemi-ionization rate coefficients, particularly in the lower part of the block of the Rydberg states. Different possible channels of the (n-n')-mixing influence on chemi-ionization rate coefficients will be demonstrated. The possibility of interpretation of the (n-n')-mixing influence will be considered on the basis of two existing methods for describing of the inelastic processes in symmetrical atom Rydberg-atom collisions.

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Quantum logic gates using coherent population trapping states

Vudayagiri

2011

Pramana - J Phys

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A scheme is proposed for achieving a controlled phase gate using interaction between atomic spin dipoles. Further, the spin states are prepared in coherent population trap states (CPTs), which are robust against perturbations, laser fluctuations etc. We show that one-qubit and two-qubit operations can easily be obtained in this scheme. The scheme is also robust against decoherences due to spontaneous emissions as the CPT states used are dressed states formed out of Zeeman sublevels of ground states of the bare atom. However, certain practical issues are of concern in actually obtaining the scheme, which are also discussed at the end of this paper.Conventional computers handle information in the form of bits -which take up values 0 or 1. Quantum computers on the other hand, use quantum bits (qubits), which can be prepared in states 0, 1 or any superposition of the two. Algorithms of quantum computation exploit this unique feature of quantum mechanical system to solve certain class of computational problems with lesser number of steps [1]. Hence there is a race to produce a reliable, robust and scalable quantum mechanical system which can be used as gates for quantum logic. There have been several attempts in the past to prepare such a system, using NMR of large molecules, quantum dot structures, ions in linear traps or neutral atoms in optical lattices [2,3], each system with its own benefits and drawbacks. One of the major requirement for designing a QC system is that they should be robust and reliable while interactions between any two of them should be on-demand. One such system is proposed here which involves neutral atoms prepared in coherent population trap (CPT) states. It is shown in this paper that such systems can be easily prepared and manipulated and it is possible to build onequbit and two-qubit gates using them. Since CPT states are 'dark states' of the atom-light interaction, the atoms prepared in such states will not interact with the light any more [4,5]. They will not evolve in time also, since they are already eigenstates of the full Hamiltonian that consist of atomic as well as interaction terms.

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Collisional and thermal ionization of sodium Rydberg atoms: I. Experiment fornS andnD atoms withn= 8–20

Cited by 24 publications

References 36 publications

Ionization of sodium and rubidiumnS,nP, andnDRydberg atoms by blackbody radiation

Ionization of sodium and rubidiumnS,nP, andnDRydberg atoms by blackbody radiation

Non-Elastic Processes in Atom Rydberg-Atom Collisions: Review of State of Art and Problems

Quantum logic gates using coherent population trapping states

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