High-fidelity multiphoton-entangled cluster state with solid-state quantum emitters in photonic nanostructures

Tiurev, Konstantin; Appel, Martin Hayhurst; Mirambell, Pol Llopart; Lauritzen, Mikkel Bloch; Tiranov, Alexey; Lodahl, Peter; Sørensen, Anders S.

doi:10.1103/physreva.105.l030601

Cited by 30 publications

(14 citation statements)

References 81 publications

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“…Surprisingly enough, any pure state of n ancillas adopts an MPS representation [73][74][75][76][77][78]. However, the MPS rank for a generally correlated state grows exponentially with n. On the other hand, many important states of correlated ancillas such as few-photon wavepackets [46][47][48][49], artificial photonic tensor network states [37,[88][89][90][91][92][93], and ground states of gapped one-dimensional local Hamiltonians for the spin chains [94] are described by MPSs with a low MPS rank. As the state of ancillas is mixed in general, we exploit the MPDO formalism.…”

Section: Collision Model With a Generally Correlated State Of Ancillasmentioning

confidence: 99%

Multipartite Correlations in Quantum Collision Models

Filippov

2022

Entropy

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Quantum collision models have proved to be useful for a clear and concise description of many physical phenomena in the field of open quantum systems: thermalization, decoherence, homogenization, nonequilibrium steady state, entanglement generation, simulation of many-body dynamics, and quantum thermometry. A challenge in the standard collision model, where the system and many ancillas are all initially uncorrelated, is how to describe quantum correlations among ancillas induced by successive system-ancilla interactions. Another challenge is how to deal with initially correlated ancillas. Here we develop a tensor network formalism to address both challenges. We show that the induced correlations in the standard collision model are well captured by a matrix product state (a matrix product density operator) if the colliding particles are in pure (mixed) states. In the case of the initially correlated ancillas, we construct a general tensor diagram for the system dynamics and derive a memory-kernel master equation. Analyzing the perturbation series for the memory kernel, we go beyond the recent results concerning the leading role of two-point correlations and consider multipoint correlations (Waldenfelds cumulants) that become relevant in the higher-order stroboscopic limits. These results open an avenue for the further analysis of memory effects in collisional quantum dynamics.

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Section: Collision Model With a Generally Correlated State Of Ancillasmentioning

confidence: 99%

Multipartite Correlations in Quantum Collision Models

Filippov

2022

Entropy

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“…In this Letter, we present a versatile, fiber-coupled single-photon source based on a silicon-vacancy center in diamond which features high efficiency, purity, temporal control, integrability, and access to auxiliary spin memory registers. It can also directly interface with existing quantum memories, enabling future compatibility with repeater-based quantum networks as well as protocols for the generation of streams of entangled photonic graph states, which are key resources in rapid one-way quantum communication and measurement-based quantum computation protocols [27][28][29][30][31][32].…”

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confidence: 99%

“…We record the number of consecutive n-photon streams detected (Fig. 4) as a proxy for the complexity of multiphoton states that are necessary for the implementation of quantum information protocols such as one-way quantum communication or computing with photonic cluster states [27][28][29][30][31][32]. Notably, the experiment was operating autonomously during this 24-hour run.…”

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confidence: 99%

Efficient Source of Shaped Single Photons Based on an Integrated Diamond Nanophotonic System

et al. 2022

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An efficient, scalable source of shaped single photons that can be directly integrated with optical fiber networks and quantum memories is at the heart of many protocols in quantum information science. We demonstrate a deterministic source of arbitrarily temporally shaped single-photon pulses with high efficiency [detection efficiency ¼ 14.9%] and purity [g ð2Þ ð0Þ ¼ 0.0168] and streams of up to 11 consecutively detected single photons using a silicon-vacancy center in a highly directional fiberintegrated diamond nanophotonic cavity. Combined with previously demonstrated spin-photon entangling gates, this system enables on-demand generation of streams of correlated photons such as cluster states and could be used as a resource for robust transmission and processing of quantum information.

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“…1d. A Ry (π/2) pulse prepares the spin in a superposition of the two spin ground states |⇓ and |⇑ , while Ry (π) serves two purposes: (1) to invert the spin in-between the two scattering events to create entanglement, and; (2) to prolong the spin coherence time by acting as a spin-echo pulse between the two equally long time-bins [29]. Ŝ corresponds to the photon being reflected (transmitted) when the QD state is in |⇑ (|⇓ ) (Fig.…”

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confidence: 99%