Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides

Dreeßen, Chris; Ouellet-Plamondon, C.; Tighineanu, Petru; Zhou, Xiaoyan; Midolo, Leonardo; Sørensen, Anders S.; Lodahl, Peter

doi:10.1088/2058-9565/aadbb8

Cited by 13 publications

(10 citation statements)

References 53 publications

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“…The circuit will also enable improving the collection efficiency for more advanced excitation schemes relying on dichromatic laser pulses 36 , which are typically limited by low-efficiency spectral filters. Large Purcell enhancement of the radiative decay rate for overcoming residual decoherence and increasing the source repetition rate can also be achieved through a small modification of the circuit 37 . The modified circuit includes an additional photonic crystal (same parameters as the first one) after the emitter section to form a standing-wave cavity for QD emission in mode C. An obvious next step is to implement direct chip-to-fiber coupling 38 thereby circumventing the loss associated with collection, mode shaping and subsequent fiber coupling.…”

Section: Discussionmentioning

confidence: 99%

On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source

et al. 2020

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A deterministic source of coherent single photons is an enabling device for quantum information processing. Quantum dots in nanophotonic structures have been employed as excellent sources of single photons with the promise of scaling up towards multiple photons and emitters. It remains a challenge to implement deterministic resonant optical excitation of the quantum dot required for generating coherent single photons, since residual light from the excitation laser should be suppressed without compromising source efficiency and scalability. Here, we present a planar nanophotonic circuit that enables deterministic pulsed resonant excitation of quantum dots using two orthogonal waveguide modes for separating the laser and the emitted photons. We report a coherent and stable single-photon source that simultaneously achieves high-purity (g (2) (0) = 0.020 ± 0.005), high-indistinguishability (V = 96 ± 2%), and >80% coupling efficiency into the waveguide. Such 'plug-and-play' single-photon source can be integrated with on-chip optical networks implementing photonic quantum processors.

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Section: Discussionmentioning

confidence: 99%

On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source

et al. 2020

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“…Up to date, the fragility of this suspended structures limits the dimensions of free‐standing circuits: practically all experiments have been performed on waveguides shorter than a few hundred microns. Larger circuits typically suffer from bending and buckling effects as well as from vibrations that can either lead to a destruction of the waveguides or a reduction of the photon quality . Clamping the waveguides via the deposition of a low refractive index cladding material or using support structures such as tethers can reduce this effects.…”

Section: Gaas‐based Photonic Integrated Circuitsmentioning

confidence: 99%

“…Clamping the waveguides via the deposition of a low refractive index cladding material or using support structures such as tethers can reduce this effects. However, this goes to the detriment of reduced coupling efficiencies or additional scattering losses (e.g., a value of around 0.7 dB was found per tether pair at 1600 nm).…”

Section: Gaas‐based Photonic Integrated Circuitsmentioning

confidence: 99%

Semiconductor Quantum Dots for Integrated Quantum Photonics

et al. 2019

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Quantum mechanics promises to have a strong impact on many aspects of research and technology, improving classical analogues via purely quantum effects. A large variety of tasks are currently under investigation, for example, the implementation of quantum computing, sensing, metrology, and communication. From a general perspective, in a similar way as classical computing benefited by the reduction of the device footprint, enabling the realization of highly complex chips, a range of quantum applications will sensibly improve thanks to the successful realization of on-chip quantum photonics. Conversely to bulky table-top experiments, it would be very advantageous to transfer all required functionalities on the same quantum photonic chip. The key elements for quantum photonic circuits are on-demand nonclassical light sources, a versatile photonic logic, the ability to store quantum information, and highly efficient detectors, directly integrated on-chip. Among several systems capable of the efficient generation of singleand indistinguishable photons, quantum dots are rapidly establishing as one of the most appealing candidates. This paper reviews the recent progress in the on-chip integration of quantum-dot-based nonclassical light sources as well as in the development of the main building blocks, either integrated monolithically or hybridly on a compact and scalable platform. IntroductionFrom the foundation of quantum mechanics in the early 20th century to explain fundamental physical observations, over the development of transistors and lasers in the 1950s and 1960s, the second quantum revolution is now in full swing. The driving force behind this continuing "quantum footrace" are quantum mechanical effects based on superposition and entanglement that can lead to profound changes. Especially in the field of quantum information science, dramatic improvements are expected in terms of increased computational speed and communication security if compared with classical counterparts.Talking about quantum supremacy, two problems-Grover's algorithm for the efficient search in large unsorted databases and Shor's algorithm for the prime factorization of large integers-are frequently mentioned. [1][2][3] Grover's quantum search algorithm can find an element of a search space M in O( √ M) operations compared to the best known classical algorithms approximately requiring O(M) steps. [4] Shor's algorithm can prime factorize large integers with N bits in polynomial speed compared to the exponential scaling of classical algorithms. Currently, several cryptography schemes in electronic communication systems rely on the difficulty of prime factorization as its security method. Consequently, a quantum computer could break the cryptographic keys quickly by calculating or searching exhaustively all key possibilities, which may allow an eavesdropper to intercept the communication channel. [5] However, quantum key distribution schemes can be alternatively used, which are based on the secure exchange of a cryptographic key between remote...

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“…Consequently, the occupation of dark excitons leads to an effective preparation efficiency of the source of

η_{normalQD} \approx 50 %

. Furthermore, since the waveguide is two‐sided, only half of the coupled photons are collected leading to β directional

\approx 40

% based on the calculated average β‐factor for a y ‐oriented dipole in a 300 nm wide waveguide . Finally propagation loss in the 117 µm‐long nanobeam waveguide amounts to η nb = 81 ± 2%, leading to an overall photon rate at the entrance of the SSC of 5.84±0.01 MHz.…”

Section: Characterization Of the Coupling Efficiency Of The Devicementioning

confidence: 99%

“…In the present work, a single lensed fiber is used for characterization, but the developed SSC enables interfacing, for example, multiple photonic chips as well, and can readily be scaled‐up to multiple channels. As a further benefit of the fabricated device, it has been proposed that the polymer cladding may serve the dual purpose of efficiently suppressing limiting phonon decoherence processes . This paves the way for an on‐demand fiber‐coupled single‐photon source with simultaneously near‐unity degree of indistinguishability of the photons and near‐unity coupling efficiency.…”

Section: Introductionmentioning

confidence: 99%

Suspended Spot‐Size Converters for Scalable Single‐Photon Devices

et al. 2019

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The realization of a highly efficient optical spot‐size converter for the end‐face coupling of single photons from GaAs‐based nanophotonic waveguides with embedded quantum dots is reported. The converter is realized using an inverted taper and an epoxy polymer overlay providing a 1.3 µm output mode field diameter. The collection of single photons from a quantum dot into a lensed fiber with a rate of 5.84 ± 0.01 MHz is demonstrated and a chip‐to‐fiber coupling efficiency of ≈48% is estimated. The stability and compatibility with cryogenic temperatures make the epoxy waveguides a promising material to realize efficient and scalable interconnects between heterogeneous quantum photonic integrated circuits.

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Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides

Cited by 13 publications

References 53 publications

On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source

On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source

Semiconductor Quantum Dots for Integrated Quantum Photonics

Suspended Spot‐Size Converters for Scalable Single‐Photon Devices

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