Deterministic Photon Pairs and Coherent Optical Control of a Single Quantum Dot

Jayakumar, Harishankar; Predojević, Ana; Huber, Tobias; Kauten, Thomas; Solomon, Glenn S.; Weihs, Gregor

doi:10.1103/physrevlett.110.135505

Cited by 164 publications

(173 citation statements)

References 33 publications

(29 reference statements)

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“…The two-photon resonant excitation method we used [19] coherently couples the ground state and the biexciton state via a two-photon resonance (see figure 1(a) for the energy schematics of a QD). The excitation laser wavelength lies about centred between the biexciton ( 919.6 nm XX l = ) and exciton ( 917.7 nm X l = ) luminescence wavelengths.…”

Section: Quantum Dot Characteristicsmentioning

confidence: 99%

Interfacing a quantum dot with a spontaneous parametric down-conversion source

Huber

Prilmüller

Sehner

et al. 2017

Quantum Sci. Technol.

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Quantum networks require interfacing stationary and flying qubits. These flying qubits are usually nonclassical states of light. Here we consider two of the leading source technologies for nonclassical light, spontaneous parametric down-conversion and single semiconductor quantum dots. Downconversion delivers high-grade entangled photon pairs, whereas quantum dots excel at producing single photons. We report on an experiment that joins these two technologies and investigates the conditions under which optimal interference between these dissimilar light sources may be achieved.

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Section: Quantum Dot Characteristicsmentioning

confidence: 99%

Interfacing a quantum dot with a spontaneous parametric down-conversion source

Huber

Prilmüller

Sehner

et al. 2017

Quantum Sci. Technol.

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“…The experimental realization of Rabi rotations between the biexciton state and an exciton state [165], as well as between the biexciton and the ground state [149,150,18,151,166,167], which can be both described in the four-level model, has great potential impact on the field of quantum logic where exciton-biexciton systems have been proposed as two-qubit quantum gates [21,165] or as emitters of entangled photon pairs [11,12,13,14,15,16,17,18]. Rabi rotations between the ground and the biexciton state were also preformed by using two-color excitations [168].…”

Section: Rabi Rotationsmentioning

confidence: 99%

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Reiter

Kuhn

Glässl

et al. 2014

J. Phys.: Condens. Matter

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Abstract. For many applications of semiconductor quantum dots in quantum technology a well controlled state preparation of the quantum dot states is mandatory. Since quantum dots are embedded in the semiconductor matrix, the interaction with phonons plays often a major role in the preparation process. In this review, we discuss the influence of phonons on three basically different optical excitation schemes which can be used for the preparation of exciton, biexciton, and superposition states: a resonant excitation leading to Rabi rotations in the excitonic system, an excitation with chirped pulses exploiting the effect of adiabatic rapid passage, and an off-resonant excitation giving rise to a phononassisted state preparation. We give an overview over experimental and theoretical results showing the role of the phonons and compare the performance of the schemes for state preparation.

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“…In contrast, time-bin entanglement can be achieved on any quantum dot system even if the zero fine structure splitting condition is not fulfilled. Nonetheless, encoding in time-bin requires two-photon resonant excitation of the biexciton -a method that allows for the coherent generation of exclusively photon pairs [29].Here, we report on the generation of hyper-entangled photon pairs emitted by a single quantum dot. The state that we created exhibits simultaneous entanglement in two degrees of freedom: polarization and time bin.…”

mentioning

confidence: 99%

Hyperentanglement of photons emitted by a quantum dot

Prilmüller¹,

Huber²,

Müller³

et al. 2017

2017 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Entanglement is a unique quantum mechanical attribute and a fundamental resource of quantum technologies. Entanglement can be achieved in various individual degrees of freedom, nonetheless some systems are able to create simultaneous entanglement in multiple degrees of freedomhyper-entanglement. A hyper-entangled state of light represents a valuable tool capable of reducing the experimental requirements and resource overheads and it can improve the success rate of quantum information protocols. Here, we report on demonstration of polarization and time-bin hyper-entangled photons emitted from a single quantum dot. We achieved this result by applying resonant and coherent excitation on a quantum dot system with marginal fine structure splitting. Our results yield fidelities to the maximally entangled state of 0.81(6) and 0.87(4) in polarization and time-bin, respectively.Quantum dots are semiconductor emitters of quantum light, which makes them material-wise compatible with today's information technologies. Furthermore, the latest advances in the design and implementation of quantum dots shows their competence to efficiently deliver indistingishable single photons [1][2][3] and photon pairs with high degree of entanglement [4,5]. These achievements combined with the possibility of photon storage [6] show the potential of quantum dots to become building blocks of a quantum network [7]. Due to their discrete energy level structure quantum dots are inherently antibunched single photon [8] sources with sub-Poissonian statistics [9] which allows them to produce very pure single photon states [1,2].The application of entanglement of photons includes quantum communications [10,11], where it can be used as resource in information exchange protocols like teleportation [12] and entanglement swapping [13]. In addition, entanglement is an essential element of linear optical quantum computing [14]. The entanglement-enhanced quantum communication schemes such as ultra-dense coding [15] and teleportation [12] enable us, respectively, to transmit two bits in one qubit or securely communicate a quantum state. In such communication schemes the Bell-state-measurements are the crucial element. The simplest realization of a Bell-state measurement uses interference of two photons at a beam-splitter and has the disadvantage that it is efficiency limited [16,17]. The states of light that exhibit entanglement in more than one degree of freedom -hyper-entangled states [18] can be used to perform a complete Bell measurement using linear optics [19,20]. In addition, they are specifically valuable in lowering the resources overhead [21] or for increasing the success rate [22] in the teleportation scheme.Entanglement of photons emitted by quantum dots has been demonstrated in polarization [4,[23][24][25][26][27] and timebin degrees of freedom [28]. The requirements for achieving a high degree of entanglement differ for the two approaches. High degree of polarization entanglement requires the absence of fine structure splitting of the quantum d...

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Deterministic Photon Pairs and Coherent Optical Control of a Single Quantum Dot

Cited by 164 publications

References 33 publications

Interfacing a quantum dot with a spontaneous parametric down-conversion source

Interfacing a quantum dot with a spontaneous parametric down-conversion source

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Hyperentanglement of photons emitted by a quantum dot

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