Analytical Fidelity Calculations for Photonic Linear Cluster State Generation

• URL: http://arxiv.org/abs/2505.11078v1
• Date: Fri, 16 May 2025 10:08:37 GMT
• Title: Analytical Fidelity Calculations for Photonic Linear Cluster State Generation
• Authors: Rohit Prasad, Simon Reiß, Giora Peniakov, Yorick Reum, Peter van Loock, Sven Höfling, Tobias Huber-Loyola, Andreas Theo Pfenning,
• Abstract summary: We develop an algorithm that tracks the global density matrix through the process of the protocol for generating linear-cluster states.<n>We show that a near-unity entangling gate fidelity as well as near-unity state fidelity for 3-photon and 7-photon linear cluster states can be reached.
• Score: 4.122012401752171
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: By precisely timed optical excitation of their spin, optical emitters such as semiconductor quantum dots or atoms can be harnessed as sources of linear photonic cluster states. This significantly reduces the required resource overhead to reach fault-tolerant optical quantum computing. Here, we develop an algorithm that analytically tracks the global density matrix through the process of the protocol for generating linear-cluster states by Lindner and Rudolph. From this we derive a model to calculate the entangling gate fidelity and the state fidelity of the generated linear optical cluster states. Our model factors in various sources of error, such as spin decoherence and the finite excited state lifetime. Additionally, we highlight the presence of partial reinitialization of spin coherence with each photon emission, eliminating the hard limitation of coherence time. Our framework provides valuable insight into the cost-to-improvement trade-offs for device design parameters as well as the identification of optimal working points. For a combined state-of-the-art quantum dot with a spin coherence time of T_2^*=535 ns and an excited state lifetime of {\tau}=23 ps, we show that a near-unity entangling gate fidelity as well as near-unity state fidelity for 3-photon and 7-photon linear cluster states can be reached.

Related papers

• Dynamical and Emission Properties of Quantum Emitters driven by Ultra-Short Laser Pulses [0.0]
  Development of high-performance quantum technologies relies on the ability to prepare the quantum states of solid-state emitters with high fidelity.<n>We present a theoretical comparison of three single-pulse coherent control protocols: resonant Rabi oscillations, adiabatic rapid passage (ARP), and notch-filtered ARP.<n>Our results show that NARP uniquely combines the high-fidelity of adiabatic passage with intrinsic spectral separability.
  arXiv  Detail & Related papers  (2025-07-22T23:26:35Z)
• Time-bin entanglement in the deterministic generation of linear photonic cluster states [0.0]
  We theoretically investigate strategies for the deterministic creation of trains of time-bin entangled photons using an individual quantum emitter. We show the theoretical generation of linear cluster states with substantial numbers of entangled photonic qubits in full microscopic numerical simulations.
  arXiv  Detail & Related papers  (2024-03-13T13:38:45Z)
• A photonic source of heralded GHZ states [0.0]
  We build a high-rate six-photon source from a solid-state quantum emitter and a stable polarisation-based interferometer. Our results initiate a path for scalable entangling operations using heralded linear-optics implementations.
  arXiv  Detail & Related papers  (2023-08-10T17:17:28Z)
• Orbital angular momentum based intra- and inter- particle entangled states generated via a quantum dot source [0.0]
  This work employs a bright QD single-photon source to generate a complete set of quantum states for information processing with OAM photons. We first study the hybrid intra-particle entanglement between the OAM and the polarization degree of freedom of a single-photon. Then, we investigate the hybrid inter-particle entanglement, by exploiting a probabilistic two qudit OAM-based entangling gate.
  arXiv  Detail & Related papers  (2022-11-09T19:20:49Z)
• On-chip quantum information processing with distinguishable photons [55.41644538483948]
  Multi-photon interference is at the heart of photonic quantum technologies. Here, we experimentally demonstrate that detection can be implemented with a temporal resolution sufficient to interfere photons detuned on the scales necessary for cavity-based integrated photon sources. We show how time-resolved detection of non-ideal photons can be used to improve the fidelity of an entangling operation and to mitigate the reduction of computational complexity in boson sampling experiments.
  arXiv  Detail & Related papers  (2022-10-14T18:16:49Z)
• High-rate entanglement between a semiconductor spin and indistinguishable photons [0.0]
  Photonic graph states are key resources for optical quantum technologies. Spin-photon entanglement has been proposed to deterministically generate linear cluster states. We harness a semiconductor quantum dot inserted in an optical cavity for efficient photon collection.
  arXiv  Detail & Related papers  (2022-07-20T13:22:07Z)
• Regression of high dimensional angular momentum states of light [47.187609203210705]
  We present an approach to reconstruct input OAM states from measurements of the spatial intensity distributions they produce. We showcase our approach in a real photonic setup, generating up-to-four-dimensional OAM states through a quantum walk dynamics.
  arXiv  Detail & Related papers  (2022-06-20T16:16:48Z)
• Correlated steady states and Raman lasing in continuously pumped and probed atomic ensembles [68.8204255655161]
  We consider an ensemble of Alkali atoms that are continuously optically pumped and probed. Due to the collective scattering of photons at large optical depth, the steady state of atoms does not correspond to an uncorrelated tensor-product state. We find and characterize regimes of Raman lasing, akin to the model of a superradiant laser.
  arXiv  Detail & Related papers  (2022-05-10T06:54:54Z)
• Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register [48.7576911714538]
  Photonic cluster states are a powerful resource for measurement-based quantum computing and loss-tolerant quantum communication. We propose the generation of multi-dimensional lattice cluster states using a single, efficient spin-photon interface coupled strongly to a nuclear register.
  arXiv  Detail & Related papers  (2021-04-26T14:41:01Z)
• Hyperentanglement in structured quantum light [50.591267188664666]
  Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols. Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector-vortex structured modes. We generate highly entangled photon pairs at telecom wavelength that we characterise via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities.
  arXiv  Detail & Related papers  (2020-06-02T18:00:04Z)
• Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
  Integrated photonics is a robust platform for quantum information processing. Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive. Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
  arXiv  Detail & Related papers  (2020-05-19T16:46:44Z)
• Analyzing photon-count heralded entanglement generation between solid-state spin qubits by decomposing the master equation dynamics [0.0]
  We analyze and compare three different schemes that can be used to generate entanglement between spin qubits in solid-state quantum systems. We find that the limit to fidelity for each scheme is restricted by the mean wavepacket overlap of photons from each source.
  arXiv  Detail & Related papers  (2020-04-09T19:54:02Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.