Generation of entangled matter qubits in two opposing parabolic mirrors

Trautmann, Nils; Bernád, József Zsolt; Sondermann, Markus; Alber, Gernot; Sánchez-Soto, Luis L.; Leuchs, Gerd

doi:10.1103/physreva.90.063814

Cited by 4 publications

(5 citation statements)

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“…Among stationary qubit systems, a particularly interesting system for quantum information processing is a trapped ytterbium ion (Yb + ) with its S 1 2 → P 1 2 dipole transition in the UV spectral region at 369.5 nm [2,29]. It has been considered to be a good candidate to produce efficient light matter interaction [30] and entanglement of matter qubits [31].…”

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confidence: 99%

Towards a quantum interface between telecommunication and UV wavelengths: design and classical performance

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Towards a quantum interface between telecommunication and UV wavelengths: design and classical performance

et al. 2016

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“…with |ψ part (t) constituting a linear superposition of the atomic states |g 1 , |g 2 , |h , and |r . Taking into account the mode structure inside a parabolic cavity with large focal length [16,17] the one photon probability amplitudes f i (t) can be eliminated from the Schrödinger equation.…”

Section: Fig 2 (Color Onlinementioning

confidence: 99%

“…Using the results derived in Ref. [16] the driving term entering Eq. ( 5) is determined by the quantum state of the first atom, i.e.…”

Section: Fig 2 (Color Onlinementioning

confidence: 99%

“…Provided the transmission of the generated single-photon wave packet is successful the quantum state of the first atom is transferred to the distant second atom with fidelity arbitrarily close to unity if the Rabi frequency Ω is sufficiently large. Typical experimental imperfections, such as finite sizes of the parabolas or real surface properties reduce the success probability but leave the fidelity unaltered [16].…”

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confidence: 99%

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Time-Reversal-Symmetric Single-Photon Wave Packets for Free-Space Quantum Communication

et al. 2015

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Readout and retrieval processes are proposed for efficient, high-fidelity quantum state transfer between a matter qubit, encoded in the level structure of a single atom or ion, and a photonic qubit, encoded in a time-reversal-symmetric single-photon wave packet. They are based on controlling spontaneous photon emission and absorption of a matter qubit on demand in free space by stimulated Raman adiabatic passage. As these processes do not involve mode selection by high-finesse cavities or photon transport through optical fibers, they offer interesting perspectives as basic building blocks for free-space quantum-communication protocols.PACS numbers: 42.50. Pq,03.67.Bg,42.50.Ct,42.50.Ex High-fidelity quantum state transfer between single photons acting as "flying qubits" and matter qubits, such as atoms or ions, acting as "stationary" memory "qubits" is a crucial process for quantum technological applications. It is an important elementary readout and retrieval process in quantum-communication protocols [1] in which quantum information exchange between distant stationary matter qubits is achieved by photon transport through optical fibers or through free-space channels. Whereas fiber based quantum communication offers advantages for local networks [2] free-space implementations are of special interest for the realization of a future worldwide satellite-based quantum-communication network [3].Motivated by its significance for quantum communication the realization of efficient light matter coupling in free space has been subject of recent experimental [4][5][6] and theoretical [7] investigations. Although efficient, high-fidelity quantum state transfer from a matter qubit to a photonic qubit can be achieved by spontaneous photon emission, realizing the reverse process in free space is a formidable experimental challenge. Exploiting timereversal symmetry it has been shown that almost perfect absorption of a single photon in free space is possible provided the single-photon wave packet has an exponentially growing temporal envelope [7]. An interesting probabilistic method for generating and shaping a single-photon wave packet with an exponentially rising envelope has been developed recently [8,9]. The inherent probabilistic nature of the procedure stems from the usage of a photon source based on spontaneous four-wave mixing [10] and the shaping of the wave packet by using electro-optical amplitude modulation. However, the probabilistic nature of these processes is a disadvantage for applications concerning readout and retrieval processes of quantum information and procedures capable of performing such tasks on demand in a deterministic way are favorable.In fiber and cavity based quantum-communication schemes a proposal to overcome the obstacles of probabilistic photon generation and probabilistic wave packet shaping has been developed by Cirac. et al. [11] and has been implemented experimentally by Ritter et al. [12], recently. In this experiment a laser pulse controls the interaction of a single trapped atom wi...

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“…In view of the peculiar focusing properties of a parabolic mirror an intense exchange of energy between a single photon and the trapped material two-level system is expected in this scenario. In addition, this physical system offers interesting possibilities for applications in quantum communication [7], for example, as it allows for an almost lossless coupling in and coupling out of the electromagnetic field energy into and out of the cavity. Contrary to the case of extreme mode selection, in this scenario this half open cavity supports a continuum of photonic modes which can couple to the trapped material two-level system.…”

Section: Introductionmentioning

confidence: 99%

Spectral properties of spontaneous photon emission by a material twolevel system in a parabolic cavity

Alber¹,

Chizhov²

2017

Nanosystems: Phys. Chem. Math.

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The spectral properties of a photon spontaneously emitted by a material two-level system, modelling an atom or ion, in a parabolic cavity are investigated. In particular, we concentrate on the special case of a motionless two-level system positioned exactly at the focus of a parabolic cavity with a dipole moment oriented along the symmetry axis of this cavity. Treating the corresponding atom-field coupling in the dipoleand rotating wave approximation, it is demonstrated that inside the parabolic cavity the position and frequency dependence of the spectrum of the spontaneously emitted photon exhibits interesting interference patterns. These patterns are explored in detail with the help of a photon path representation of the first-order electric field correlation function. In the radiation, zone the spatial behavior of the spectrum reveals strong interference in particular at distances from the two-level system of the order of the focal length of the parabola. With increasing distances, these interference patterns decay except for an undepleted component surrounding the symmetry axis at an almost constant radius. Furthermore, the maximum of the frequency dependence of the spectrum exhibits a position-dependent frequency shift with respect to the atomic resonance frequency.

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Generation of entangled matter qubits in two opposing parabolic mirrors

Cited by 4 publications

References 28 publications

Towards a quantum interface between telecommunication and UV wavelengths: design and classical performance

Towards a quantum interface between telecommunication and UV wavelengths: design and classical performance

Time-Reversal-Symmetric Single-Photon Wave Packets for Free-Space Quantum Communication

Spectral properties of spontaneous photon emission by a material twolevel system in a parabolic cavity

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