Entangling a Hole Spin with a Time-Bin Photon: A Waveguide Approach for Quantum Dot Sources of Multiphoton Entanglement

Appel, Martin Hayhurst; Tiranov, Alexey; Pabst, Simon; Chan, Ming Lai; Starup, Christian; Wang, Ying; Midolo, Leonardo; Tiurev, Konstantin; Scholz, Sven; Wieck, A. D.; Ludwig, Arne; Sørensen, Anders S.; Lodahl, Peter

doi:10.1103/physrevlett.128.233602

Cited by 32 publications

(17 citation statements)

References 46 publications

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“…36 (see Methods). After the first Ry ðπ=2Þ pulse, due to fluctuating Overhauser nuclear fields 37 the spin state begins to fan out over the Bloch sphere equator (denoted by blue arrows) decaying with a spin dephasing time T Ã 2 ¼ 23:2 ns 14 . Applying a Ry ðπÞ pulse after time τ inverts the direction of spin precession, thus refocusing the spin state at t = 2τ.…”

Section: Spin-echo Interferometrymentioning

confidence: 99%

“…So far, significant progress has been made towards this goal, particularly the realization of spin-photon entanglement [7][8][9][10][11][12][13][14] , spinspin entanglement 13,[15][16][17][18] , single-photon switching and swap gate [19][20][21] , and photon-photon entanglement [22][23][24] using various quantum emitters. Among these platforms, quantum dots (QDs) integrated into nanophotonic structures offer near-unity coupling to light (β ≥ 98%) 25 and a high photon-generation rate with nearunity purity and coherence 26,27 .…”

Section: Introductionmentioning

confidence: 99%

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On-chip spin-photon entanglement based on photon-scattering of a quantum dot

Chan,

Tiranov,

Appel

et al. 2023

npj Quantum Inf

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The realization of on-chip quantum interfaces between flying photons and solid-state spins is a key building block for quantum-information processors, enabling, e.g., distributed quantum computing, where remote quantum registers are interconnected by flying photons. Self-assembled quantum dots integrated into nanostructures are one of the most promising systems for such an endeavor thanks to their near-unity photon-emitter coupling and fast spontaneous emission rate. Here we demonstrate high-fidelity on-chip entanglement between an incoming photon and a stationary quantum-dot hole spin qubit. The entanglement is induced by sequential scattering of the time-bin encoded photon interleaved with active spin control within a microsecond, two orders of magnitude faster than those achieved in other solid-state platforms. Conditioning on the detection of a reflected photon renders the entanglement fidelity immune to the spectral wandering of the emitter. These results represent a major step towards realizing a quantum node capable of interchanging information with flying photons and on-chip quantum logic, as required for quantum networks and quantum repeaters.

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Section: Spin-echo Interferometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On-chip spin-photon entanglement based on photon-scattering of a quantum dot

Chan,

Tiranov,

Appel

et al. 2023

npj Quantum Inf

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the crucial ingredient, namely entanglement between a single spin and a photon at the lowest loss telecommunication window, has been elusive so far. Despite the progress achieved in the 900 nm region in recent works [2][3][4], comparable performance at telecom wavelengths has not been demonstrated yet.…”

Section: Introductionmentioning

confidence: 99%

Spin-photon entanglement from a solid-state system at telecom wavelengths

Laccotripes,

Muller,

Stevenson

et al. 2024

Quantum Computing, Communication, and Simulation IV

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Efficient generation of entanglement between a stationary matter-qubit and a propagating photonic-qubit is a scientific and technological challenge of utmost importance for the realisation of fully-fledged quantum networks. Solid-state quantum emitters in the telecom C-band are a promising platform due to the minimal absorption of photons at these wavelengths and deterministic generation of high purity single photon flying qubits. Here, we use an InAs/InP quantum dot to implement an optically active spin-qubit and demonstrate high fidelity spin initialisation and coherent spin control of the resident electron. Lastly, for the first time we demonstrate high-fidelity spin-photon entanglement in a solid-state system with direct emission into the telecom C-band and obtain a lower bound on the entanglement fidelity of 80.07 %.

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“…Indistinguishable photons from such sources have facilitated important quantum technology demonstrations, including linear optical quantum computing [12,13] and entanglement swapping for quantum communications and networking [14,15]. Furthermore, similar methods can be extended to produce more complex resource states for optical quantum technologies, such as recent demonstrations of entangled graph states [16][17][18] where high fidelities are enabled by indistinguishable photons. Beyond QDs, the cavity-emitter concept has also been applied to realise photon sources using quantum emitters in other solid-state hosts such as diamond [19], silicon [20] and 2D materials [21].…”

Section: Introductionmentioning

confidence: 99%

Nanocavity enhanced photon coherence of solid-state quantum emitters operating up to 30 K

Brash,

Iles-Smith

2023

Mater. Quantum. Technol.

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Solid-state emitters such as epitaxial quantum dots have emerged as a leading platform for efficient, on-demand sources of indistinguishable photons, a key resource for many optical quantum technologies. To maximise performance, these sources normally operate at liquid helium temperatures (~4 K), introducing significant size, weight and power requirements that can be impractical for proposed applications. Here we experimentally resolve the two distinct temperature-dependent phonon interactions that degrade indistinguishability, allowing us to demonstrate that coupling to a photonic nanocavity can greatly improve photon coherence at elevated temperatures compatible with compact cryocoolers. We derive a polaron model that fully captures the temperature-dependent influence of phonons observed in our experiments, providing predictive power to further increase the indistinguishability and operating temperature of future devices through optimised cavity parameters.

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Entangling a Hole Spin with a Time-Bin Photon: A Waveguide Approach for Quantum Dot Sources of Multiphoton Entanglement

Cited by 32 publications

References 46 publications

On-chip spin-photon entanglement based on photon-scattering of a quantum dot

On-chip spin-photon entanglement based on photon-scattering of a quantum dot

Spin-photon entanglement from a solid-state system at telecom wavelengths

Nanocavity enhanced photon coherence of solid-state quantum emitters operating up to 30 K

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