Cavity QED with optically transported atoms

Sauer, J. A.; Fortier, Kevin; Chang, M.-S.; Hamley, C. D.; Chapman, Michael

doi:10.1103/physreva.69.051804

Cited by 215 publications

(158 citation statements)

References 34 publications

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“…As 300,000 high-quality single photons could be generated continuously within 30 sec, a fast implementation of our scheme is available. Moreover, to fix two atoms in an optical cavity, we have to confine the atoms in optical lattices embedded in an optical cavity, and this has been achieved experimentally [14]. To confine each atom in a particular lattice, a more advanced technique is needed.…”

Section: Is: Port I-tr1-tr1*-c-pbs-cavity I-pbs-c-tr2-hwp1-m-tr1-hwp2mentioning

confidence: 99%

Transfer and teleportation of quantum states encoded in decoherence-free subspace

et al. 2007

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Quantum state transfer and teleportation, with qubits encoded in internal states of the atoms in cavities, among spatially separated nodes of a quantum network in decoherence-free subspace are proposed, based on a cavity-assisted interaction by single-photon pulses. We show in details the implementation of a logic-qubit Hadamard gate and a two-logic-qubit conditional gate, and discuss the experimental feasibility of our scheme.PACS numbers: 03.67. Hk, 42.50.Dv Quantum state transfer and teleportation are significant components in quantum information processing, especially for quantum network. As the confined atoms in cavity QED system are well suited for storing qubits in long-lived internal states, spatially separated cavities could be used to build a quantum network assisted by photons [1,2,3,4,5,6,7,11]. On the other hand, decoherence due to the inevitable interaction with environment destroys quantum coherence. So decoherence-free subspaces (DFSs) of Hilbert space has been introduced to protect against some errors due to environmental coupling with certain symmetry [8,9,10]. For example, Ref.[10] utilized two atoms to encode single-logic-qubit, i.e.,, which are robust to collective dephasing error caused by ambient magnetic fluctuation.In this Brief Report, for the quantum state encoded in DFS mentioned above, we present implementation of single-logic-qubit Hadamard gate and two-logic-qubit conditional gate based on cavity-assisted interaction with single-photon pulses. Based on these gates, we will carry out the quantum state transfer and teleportation between two spatially separated nodes in a quantum network. Compared with previous related works, our proposal does not rely on the synchronous optical lattices [4] in implementation of the single-logic-qubit Hadamard gate. In addition, auxiliary entangled photon pairs, as employed in [5], are unnecessary in our two-logic-qubit conditional gate. Moreover, for quantum state transfer, neither the entangled photon pairs [11] nor the special time-symmetric wave packet of the photons [1] is necessary in our scheme. So our scheme could not only protect quantum information from some decoherence, but also reduce the experimental difficulty compared to the previous schemes [1,4,5,11]. Furthermore, in our scheme, each node of the quantum network in DFS has individual input port for photons to complete necessary operations, and different operational results can be distinguished by * Electronic address: huawei.hw@gmail.com † Electronic address: mangfeng1968@yahoo.com detecting output photons.The main idea using cavity-assisted photon scattering to realize a controlled phase flip (CPF) between two atoms [3,4,5,6,11], is sketched below. Suppose that two identical atoms, each of which has a three-level configuration, are well located in a high-finesse cavity. The levels |0 and |e of the atom are resonantly coupled by the bare cavity mode with h polarization or by the h component of an input photon, while level |1 is decoupled because of the large detuning, as shown in Fi...

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Section: Is: Port I-tr1-tr1*-c-pbs-cavity I-pbs-c-tr2-hwp1-m-tr1-hwp2mentioning

confidence: 99%

Transfer and teleportation of quantum states encoded in decoherence-free subspace

et al. 2007

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“…1. Differently from recent theoretical works on cavity cooling of atomic clouds [10], here the center of mass is confined by a tight trap, in a configuration that may correspond to the experimental situations reported, for instance, in [4,11,12]. Starting from a master equation for the quantum variables of the dipole, cavity, and center of mass, we derive a closed equation for the center-of-mass dynamics.…”

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confidence: 99%

Cooling Trapped Atoms in Optical Resonators

2005

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We derive an equation for the cooling dynamics of the quantum motion of an atom trapped by an external potential inside an optical resonator. This equation has broad validity and allows us to identify novel regimes where the motion can be efficiently cooled to the potential ground state. Our result shows that the motion is critically affected by quantum correlations induced by the mechanical coupling with the resonator, which may lead to selective suppression of certain transitions for the appropriate parameters regimes, thereby increasing the cooling efficiency. DOI: 10.1103/PhysRevLett.95.143001 PACS numbers: 32.80.Pj, 32.80.Lg, 42.50.Pq Cavity cooling is a recent expression, which stresses the role of the mechanical effects of a resonator on the atomic and molecular center-of-mass dynamics. Indeed, the coupling between resonator and atom gives rise to complex dynamics, one aspect of which is the substantial modification of the atom spectroscopic properties [1]. This property allows one to change the atom scattering cross section, thereby affecting, and eventually tailoring, the mechanical dynamics of the atomic center of mass [2]. Moreover, the motion of the atom changes the medium density, thereby affecting the resonator field itself. Several recent experiments have reported relevant features of these complex dynamics [3][4][5][6][7][8]. Experimental demonstrations of atom cooling in resonators [3][4][5][6][7] have shown, among others, that cavities are a promising tool for preparing and controlling cold atomic samples of scalable dimensions, which may find relevant applications, for instance, in quantum information processing [9].In this Letter, we present a study of the quantum dynamics of the center-of-mass motion of an atomic dipole, which couples to a resonator and to a laser field driving it from the side. The system is sketched in Fig. 1. Differently from recent theoretical works on cavity cooling of atomic clouds [10], here the center of mass is confined by a tight trap, in a configuration that may correspond to the experimental situations reported, for instance, in [4,11,12]. Starting from a master equation for the quantum variables of the dipole, cavity, and center of mass, we derive a closed equation for the center-of-mass dynamics. This equation generalizes previous theoretical studies [13,14] and allows us to identify novel parameter regimes, where cooling can be efficient. Moreover, its form permits us to identify the individual scattering contributions, thereby gaining insight into the role of the various physical parameters. We show that quantum correlations between atom and resonator may lead to the suppression of scattering transitions, thereby enhancing the cooling efficiency.The starting point is the master equation for an atom of mass M whose dipole transition between the ground and excited states jgi and jei couples (quasi)resonantly to a laser and the mode of an optical resonator with wave vector k L and k c , respectively (jk L j jk c j k). In the reference frame of the laser, the...

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“…A number of groups [104][105][106][107] have therefore realized optical dipole force traps, also known as far off-resonant traps or FORTs. They use a far-detuned optical beam inducing a dissipative, attractive force on an atom and since they are operated far off-resonance, they cause practically no atomic excitation.…”

Section: Atoms Pushed By a Few Photonsmentioning

confidence: 99%

The Deterministic Generation of Photons by Cavity Quantum Electrodynamics

Walther

2007

Elements of Quantum Information

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Cavity quantum electrodynamics allows the study of strong coupling between excited atoms and a single mode of a resonant cavity. As a consequence of the strong coupling the cavity field and the atom are entangled. The system thus provides important ingredients necessary for studies of quantum information processing. In addition the periodic exchange of a photon between atom and cavity can be studied. It thus represents the ideal system to investigate the Jaynes-Cummings model and to study a variety of phenomena related to the dynamics of the photon exchange such as collapse and revivals depending on the statistics of the photon field. Furthermore, it is an ideal system to study the quantum measurement process. The system leads to masers and lasers which sustain oscillations with less than one atom on average in the cavity and can, in addition, be used as a deterministic photon source. The setup allows to study in detail the conditions necessary to obtain nonclassical radiation, i.e. radiation with sub-Poissonian photon statistics and even photon number states; this is the case even when Poissonian pumping is used. This paper reviews the work on cavity quantum electrodynamics performed with the one-atom maser and with a single ion trap laser. We will start with the discussion of the one-atom maser. For a more detailed discussion of those experiments see also [1].

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Cavity QED with optically transported atoms

Cited by 215 publications

References 34 publications

Transfer and teleportation of quantum states encoded in decoherence-free subspace

Transfer and teleportation of quantum states encoded in decoherence-free subspace

Cooling Trapped Atoms in Optical Resonators

The Deterministic Generation of Photons by Cavity Quantum Electrodynamics

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