Highly efficient source for indistinguishable single photons of controlled shape

Nisbet‐Jones, P. B. R.; Dilley, Jerome; Ljunggren, Daniel; Kuhn, Axel

doi:10.1088/1367-2630/13/10/103036

Cited by 86 publications

(96 citation statements)

References 22 publications

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“…In contrast to these, ultra-narrowband indistinguishable photons can be readily obtained on-demand from real single atoms in strong coupling to high-finesse cavities [10][11][12]. These systems emit mutually coherent photons [13], they have been used to generate photonatom entanglement [14] and distant atom-atom entanglement [15], they can be used for quantum memories [16] and they can be used to individually tailor the phase and coherence envelope of each emitted single photon [17,18]. We seek the benefits of both integrated quantum photonic circuits and atom-cavity photon sources.…”

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confidence: 99%

“…These systems emit mutually coherent photons [13], they have been used to generate photonatom entanglement [14] and distant atom-atom entanglement [15], they can be used for quantum memories [16] and they can be used to individually tailor the phase and coherence envelope of each emitted single photon [17,18]. We seek the benefits of both integrated quantum photonic circuits and atom-cavity photon sources.Our demonstration operates integrated photonic quantum logic with ultra-narrow-band single photons, emitted on-demand from single 87 Rb atoms coupled to a highfinesse optical cavity [17,19]. We encode qubits on each single photon, that occupies one of two optical waveguides to demonstrate two-qubit logic using a probabilistic CNOT gate [20,21] integrated within a silica-on-silicon chip [5].…”

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confidence: 99%

“…Our demonstration operates integrated photonic quantum logic with ultra-narrow-band single photons, emitted on-demand from single 87 Rb atoms coupled to a highfinesse optical cavity [17,19]. We encode qubits on each single photon, that occupies one of two optical waveguides to demonstrate two-qubit logic using a probabilistic CNOT gate [20,21] integrated within a silica-on-silicon chip [5].…”

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confidence: 99%

“…Single photons of 60 m (200 ns) coherence length are derived from a strongly coupled atom-cavity system. This is accomplished with a coherently controlled vacuumstimulated Raman transition in 87 Rb with a repetition rate of 1 MHz and an efficiency > 60% [11,12,17,19]. The source operates intermittently for periods of up to 60 µs due to the stochastic delivery of atoms to the cavity with an atomic fountain.…”

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Quantum Logic with Cavity Photons From Single Atoms

et al. 2016

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Increasing control of single photons enables new applications of photonic quantum-enhanced technology and further experimental exploration of fundamental quantum phenomena. Here, we demonstrate quantum logic using narrow linewidth photons that are produced under nearly perfect quantum control from a single 87 Rb atom strongly coupled to a high-finesse cavity. We use a controlled-NOT gate integrated into a photonic chip to entangle these photons, and we observe non-classical correlations between events separated by periods exceeding the travel time across the chip by three orders of magnitude. This enables quantum technology that will use the properties of both narrowband single photon sources and integrated quantum photonics, such as networked quantum computing, narrow linewidth quantum enhanced sensing and atomic memories.New applications of single photons will continue to emerge from increased control of both their emission and their subsequent processing with photonic components. Today, intrinsically probabilistic photon sources, such as spontaneous parametric down conversion, are widely used for proof-of-principle photonic quantum technologies. This is because of control over properties such as entanglement [1] and spectrum [2], and increasingly because of the demonstrated compatibility with integrated quantum photonics [3]. But probabilistic sources can only generate high numbers of photons with an overhead of fast switching and optical delays [4]. Deterministic single photon emitters circumvent this overhead whilst providing valuable capabilities such as mediating entangling operations and acting as quantum memories. Here we demonstrate that it is also possible to operate integrated quantum logic with ultra-narrowband photons emitted on-demand from single 87 Rb atoms.Integrated optics is a viable approach to control photons after they have been generated, with increasingly complex, miniature, and programable quantum circuits [3,5,6]. Single photon emitters are being used with photonic quantum logic with the aim of increasing capability. For instance, sequentially emitted photons from single quantum dots have been used to measure the logical truth table of an on-chip controlled-NOT gate (CNOT) [7] and entangled using a bulk-optical CNOT [8]; photons emitted from diamond colour centres have been manipulated with an on-chip interferometer [9]. These emitters can be regarded as artificial atomic systems. In contrast to these, ultra-narrowband indistinguishable photons can be readily obtained on-demand from real single atoms in strong coupling to high-finesse cavities [10][11][12]. These systems emit mutually coherent photons [13], they have been used to generate photonatom entanglement [14] and distant atom-atom entanglement [15], they can be used for quantum memories [16] and they can be used to individually tailor the phase and coherence envelope of each emitted single photon [17,18]. We seek the benefits of both integrated quantum photonic circuits and atom-cavity photon sources.Our demonstration operates i...

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Quantum Logic with Cavity Photons From Single Atoms

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“…Moreover, significant efforts have been devoted to generate single photons with tunable temporal shapes202628293031323334, which is important for many applications in quantum information science3536. However, most of the previous approaches offered only a limited tuning range of the photon duration up to at most one order of magnitude202632.…”

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Generation of single photons with highly tunable wave shape from a cold atomic ensemble

et al. 2016

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The generation of ultra-narrowband, pure and storable single photons with widely tunable wave shape is an enabling step toward hybrid quantum networks requiring interconnection of remote disparate quantum systems. It allows interaction of quantum light with several material systems, including photonic quantum memories, single trapped ions and opto-mechanical systems. Previous approaches have offered a limited tuning range of the photon duration of at most one order of magnitude. Here we report on a heralded single photon source with controllable emission time based on a cold atomic ensemble, which can generate photons with temporal durations varying over three orders of magnitude up to 10 μs without a significant change of the readout efficiency. We prove the nonclassicality of the emitted photons, show that they are emitted in a pure state, and demonstrate that ultra-long photons with nonstandard wave shape can be generated, which are ideally suited for several quantum information tasks.

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Cavity Induced Interfacing of Atoms and Light

Kuhn

2015

Engineering the Atom-Photon Interaction

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This chapter introduces cavity-based light-matter quantum interfaces, with a single atom or ion in strong coupling to a high-finesse optical cavity. We discuss the deterministic generation of indistinguishable single photons from these systems; the atom-photon entanglement intractably linked to this process; and the information encoding using spatio-temporal modes within these photons. Furthermore, we show how to establish a time-reversal of the aforementioned emission process to use a coupled atom-cavity system as a quantum memory. Along the line, we also discuss the performance and characterisation of cavity photons in elementary linear-optics arrangements with single beam splitters for quantum-homodyne measurements. arXiv:1502.06741v1 [quant-ph]

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Highly efficient source for indistinguishable single photons of controlled shape

Cited by 86 publications

References 22 publications

Quantum Logic with Cavity Photons From Single Atoms

Quantum Logic with Cavity Photons From Single Atoms

Generation of single photons with highly tunable wave shape from a cold atomic ensemble

Cavity Induced Interfacing of Atoms and Light

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