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Staanum, Peter; Jensen, Inger S.; Martinussen, R.; Voigt, D.; Drewsen, Michael

doi:10.1103/physreva.69.032503

Cited by 29 publications

(26 citation statements)

References 23 publications

(58 reference statements)

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“…3(b) to Eq. (4) gives the characteristic lifetime T DCRT 1 = 1130(47) ms for the DCRT technique (green line) and T trad 1 = 1160(30) ms for the traditional method (blue dotted line), which are in good agreement with previously measured values [28] of 1148(18) ms.…”

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confidence: 88%

Experimental Characterization of Quantum Dynamics Through Many-Body Interactions

et al. 2013

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We report on the implementation of a quantum process tomography technique known as direct characterization of quantum dynamics applied on coherent and incoherent single-qubit processes in a system of trapped (40)Ca(+) ions. Using quantum correlations with an ancilla qubit, direct characterization of quantum dynamics reduces substantially the number of experimental configurations required for a full quantum process tomography and all diagonal elements of the process matrix can be estimated with a single setting. With this technique, the system's relaxation times T(1) and T(2) were measured with a single experimental configuration. We further show the first, complete characterization of single-qubit processes using a single generalized measurement realized through multibody correlations with three ancilla qubits.

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confidence: 88%

Experimental Characterization of Quantum Dynamics Through Many-Body Interactions

et al. 2013

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“…Due to the heralding, high fidelity will be achieved independent of the efficiency of the process. We describe in detail the requirements and conditions for such heralded quantum storage processes for the case of singly ionized calcium-40, the species used in our [8][9][10][11] and other experiments [12][13][14][15][16]. Application to other species is straightforward.…”

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confidence: 99%

Single calcium-40 ion as quantum memory for photon polarization: a case study

Müller

Eschner

2013

Appl. Phys. B

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We present several schemes for heralded storage of polarization states of single photons in single ions, using the 40 Ca + ion and photons at 854 nm wavelength as specific example. We compare the efficiencies of the schemes and the requirements for their implementation with respect to the preparation of the initial state of the ion, the absorption process and its analysis. These schemes may be used to create and herald entanglement of two distant ions through entanglement swapping; they are easily adapted to other atomic systems and wavelengths.The controlled transfer of quantum states between different systems is a cornerstone in the realization of quantum networks. One proposed implementation [1] of such a network employs single atoms for storing information (i. e., as nodes of the network) and single photons for transmitting information (i. e., as channels of the network); they are interfaced through controlled absorption and emission.In atom-photon interaction, the conservation of angular momentum relates the internal state of the atom with the polarization state of the exchanged photon. In emission, this generates atom-photon entanglement which may be used to prepare a certain superposition of Zeeman sublevels in the atom by measuring an emitted photon in a certain polarization basis [2,3], or to preserve such a superposition state in the context of quantum error correction [4]. In absorption, a certain polarization state of the photon excites the absorbing atom into the corresponding superposition of Zeeman sublevels. Using neutral rubidium-87 in this way as a quantum memory for an arbitrary polarization state of a photon at 780 nm has been proposed by [5] and put into effect by [6,7], using optical cavities to attain high efficiency.Here, we propose schemes employing both absorption and emission to implement heralded storage of the polarization state of a photon. First, the atom is prepared in a pure state ready to absorb a single photon. The absorption of a (certain but unknown) polarization state excites the atom into a corresponding superposition. Afterward, the excited atomic levels decay to different final levels, and another photon is emitted, which is entangled with the atom. By choosing the proper detection basis for this photon, the emission channels are made indistinguishable and the detection heralds the storage process but does not reveal the stored information. Due to the heralding, high fidelity will be achieved independent of the efficiency of the process. We describe in detail the requirements and conditions for such heralded quantum storage processes for the case of singly ionized calcium-40, the species used in our [8][9][10][11] and other experiments [12][13][14][15][16]. Application to other species is straightforward.In the proposed quantum-memory schemes, a single 40 Ca + ion is used to store the polarization state of a single photon at 854 nm wavelength (cf. fig. 1 a): the absorption happens on the 3 D 5/2 -4 P 3/2 transition and the emission of the herald takes place on the 4 P 3/2...

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“…Superradiance and subradiance at the level of ±1 % has been experimentally observed in the 6p 2 P 1/2 to 6s 2 S 1/2 decay rate in a pair of Ba + ions separated by about 1.5 µm [203]. Also in an ensemble of 10 Ca + ions, some unexpected double jumps were reported [194], but subsequent experiments with greater statistics found no correlations or enhanced double or triple jump rates [175][176][177]. In our experiment, the distance between ions is typically around 10 µm (see Section 3.5) and thus we expect cooperative effects between ions to be negligible.…”

Section: Correctionsmentioning

confidence: 92%

“…An early lifetime measurement in Ba + reported some indication of cooperative effects in an experiment with multiple ions [173], although later calculations show this explanation to be unlikely [174]. Correlation effects and a dependence of the lifetime on the number of stored ions have also been investigated in trapped Ca + ions [175][176][177], where within experimental uncertainty no dependence was found. The long-lived levels in Ba + are particularly sensitive to perturbations as their lifetimes are more than an order of magnitude longer than those of the other species.…”

Section: Lifetime Of the 5d 2 D 5/2 Level In 138 Ba + From Quantum Jumpsmentioning

confidence: 99%

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Spectroscopy of Trapped ¹³⁸Ba⁺ Ions for Atomic Parity Violation and Optical Clocks

Dijck

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Trapped Ba + and Ra + ions offer the possibility to test the Standard Model by performing an independent high-precision determination of the Weinberg angle (sin 2 θ W) at low momentum transfer. In such a measurement of atomic parity violation, table-top experiments complement studies of weak interaction effects at high energy in the search for new physics. The singly-charged heavy alkaline earth metal ions combine high intrinsic sensitivity with tractable atomic structure owing to their single valence electron. In addition, trapped Ba + or Ra + ions can serve as reference for an optical atomic clock that is sensitive to variation of the fine structure constant α. Determining sin 2 θ W requires localizing a single laser-cooled Ba + or Ra + ion in a standing-wave light field to a fraction of an optical wavelength. High-precision atomic theory calculations are crucial for interpreting the measurements and need experimental input. We have performed preparatory spectroscopy measurements with trapped Ba + ions and investigated experimental techniques for characterizing ion traps. We have determined the optical transition frequencies between low-lying levels of 138 Ba + with laser spectroscopy referenced to an optical frequency comb. Using a lineshape model based on eight-level optical Bloch equations, we determined the 6s 2 S 1/2-5d 2 D 3/2 transition frequency to be 146 114 384.0(0.1) MHz and the 5d 2 D 3/2-6p 2 P 1/2 transition frequency to be 461 311 878.5(0.1) MHz, obtaining for the first time sub-MHz precision on these transitions. Light shifts play an important role in the measurement of sin 2 θ W and offer a way to obtain information on (ratios of) atomic transition matrix elements. We have carried out an exploratory study of the light shift in 138 Ba + caused by an off-resonant laser tuned close to the 5d 2 D 3/2-6p 2 P 1/2 transition. The observed spectra are analyzed by combining the optical lineshapes with calculated light shifts of individual Zeeman components. Atomic state lifetimes provide a benchmark for calculations of transition amplitudes. We have measured the lifetime of the long-lived 5d 2 D 5/2 level in 138 Ba + using a technique based on quantum jumps with one to four trapped ions. We have investigated known systematic effects in detail to evaluate their influence. We measured the lifetime of the 5d 2 D 5/2 level to be 26.3(0.6) s, which is about 4σ shorter than previously published experimental results. This discrepancy needs to be clarified to ensure the reliability of atomic parity violation measurements ahead. This work contributes toward a precise determination of sin 2 θ W with trapped Ba + or Ra + ions in search of physics beyond the Standard Model.

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Lifetime measurement of the metastable3dD5∕22state in the

Cited by 29 publications

References 23 publications

Experimental Characterization of Quantum Dynamics Through Many-Body Interactions

Experimental Characterization of Quantum Dynamics Through Many-Body Interactions

Single calcium-40 ion as quantum memory for photon polarization: a case study

Spectroscopy of Trapped ¹³⁸Ba⁺ Ions for Atomic Parity Violation and Optical Clocks

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