On-chip generation of multi-qubit graph states with high-dimensional encoded single photons

• URL: http://arxiv.org/abs/2608.03012v1
• Date: Tue, 04 Aug 2026 01:49:56 GMT
• Title: On-chip generation of multi-qubit graph states with high-dimensional encoded single photons
• Abstract summary: Photonic multi-qubit entanglement is key to optical quantum information processing, particularly universal quantum computing.<n>Here we propose an explicit and resource-efficient high-dimensional encoding approach to achieve the target multi-qubit quantum state.
• Score: 5.726101130718763
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Photonic multi-qubit entanglement is key to optical quantum information processing, particularly universal quantum computing. Yet multi-photon sources suffer from low emission efficiency, making single-photon high-dimensional encoding an appealing alternative. Here we propose an explicit and resource-efficient high-dimensional encoding approach to achieve the target multi-qubit quantum state. The technically challenging preparation of multi-photon quantum states is replaced by single-photon operations involving high-dimensional expansion, routing, and multi-layered quantum measurement. Besides, each photon in the resource multi-photon quantum state can be used to encode multiple qubits in a distributed manner, and a larger entangled state will be constructed. We demonstrate this approach using programmable photonic integrated circuits, where multi-qubit graph states--including the Greenberger-Horne-Zeilinger state and the cluster state--are generated and characterized. We additionally demonstrate the Grover search algorithm using the single-photon cluster state. Our findings unlock a novel route towards diverse entangled state generation with photons and advance large-scale and universal photonic quantum information processing.

Related papers

• Scalable quantum interference in integrated lithium niobate nanophotonics [40.13294159814764]
  integrated lithium niobate is a prime contender for a monolithic quantum photonics platform.<n>We show bosonic interference between indistinguishable photons, a crucial interaction for many photonic quantum computing protocols.
  arXiv  Detail & Related papers  (2025-06-25T15:06:53Z)
• Entanglement of photonic modes from a continuously driven two-level system [34.50067763557076]
  We experimentally generate entangled photonic modes by continuously exciting a quantum emitter, a superconducting qubit, with a coherent drive.<n>We show that entanglement is generated between modes extracted from the two sidebands of the resonance fluorescence spectrum.<n>Our approach can be utilized to distribute entanglement at a high rate in various physical platforms.
  arXiv  Detail & Related papers  (2024-07-10T18:48:41Z)
• On-chip quantum interference between independent lithium niobate-on-insulator photon-pair sources [35.310629519009204]
  A lithium niobate-on-insulator (LNOI) integrated photonic circuit generates a two-photon path-entangled state, and a programmable interferometer for quantum interference. We generate entangled photons with $sim2.3times108$ pairs/s/mW brightness and perform quantum interference experiments on the chip with $96.8pm3.6%$ visibility. Our results provide a path towards large-scale integrated quantum photonics including efficient photon-pair generation and programmable circuits for applications such as boson sampling and quantum communications.
  arXiv  Detail & Related papers  (2024-04-12T10:24:43Z)
• Resource-efficient photonic quantum computation with high-dimensional cluster states [0.0]
  A promising route to scalability is photonic measurement-based quantum computation, where single-qubit measurements on large cluster states enable fault-tolerant quantum computation. We tackle this challenge by encoding multiple qubits on each photon through high-dimensional spatial encoding, generating cluster states with over nine qubits at a rate of 100Hz. Our findings pave the way for resource-efficient measurement-based quantum computation using high-dimensional entanglement.
  arXiv  Detail & Related papers  (2023-09-19T09:32:43Z)
• Scalable generation and detection of on-demand W states in nanophotonic circuits [4.495431203748202]
  We generate an 8-mode on-demand single photon W states, using nanowire quantum dots and a silicon nitride photonic chip. We demonstrate a reliable, scalable technique for reconstructing W-state in photonic circuits using Fourier and real-space imaging, supported by the Gerchberg-Saxton phase retrieval algorithm. The study provides a new imaging approach of assessing multipartite entanglement in W-states, paving the way for further progress in image processing and Fourier-space analysis techniques for complex quantum systems.
  arXiv  Detail & Related papers  (2023-07-12T12:15:13Z)
• Simulation of Entanglement Generation between Absorptive Quantum Memories [56.24769206561207]
  We use the open-source Simulator of QUantum Network Communication (SeQUeNCe), developed by our team, to simulate entanglement generation between two atomic frequency comb (AFC) absorptive quantum memories. We realize the representation of photonic quantum states within truncated Fock spaces in SeQUeNCe. We observe varying fidelity with SPDC source mean photon number, and varying entanglement generation rate with both mean photon number and memory mode number.
  arXiv  Detail & Related papers  (2022-12-17T05:51:17Z)
• High-speed thin-film lithium niobate quantum processor driven by a solid-state quantum emitter [2.308881946683637]
  We develop an integrated photonic platform based on thin-film lithium niobate. We interface it with deterministic solid-state single-photon sources based on quantum dots in nanophotonic waveguides. We realize a variety of key photonic quantum information processing functionalities with the high-speed circuits.
  arXiv  Detail & Related papers  (2022-11-10T17:15:08Z)
• Experimental Multi-state Quantum Discrimination in the Frequency Domain with Quantum Dot Light [40.96261204117952]
  In this work, we present the experimental realization of a protocol employing a time-multiplexing strategy to optimally discriminate among eight non-orthogonal states. The experiment was built on a custom-designed bulk optics analyser setup and single photons generated by a nearly deterministic solid-state source. Our work paves the way for more complex applications and delivers a novel approach towards high-dimensional quantum encoding and decoding operations.
  arXiv  Detail & Related papers  (2022-09-17T12:59:09Z)
• Deterministic Generation of Multidimensional Photonic Cluster States with a Single Quantum Emitter [1.2233362977312945]
  We present an experimental implementation in the microwave domain of a resource-efficient scheme for the deterministic generation of 2D photonic cluster states. By utilizing a coupled resonator array as a slow-light waveguide, a single flux-tunable transmon qubit as a quantum emitter, and a second auxiliary transmon as a switchable mirror, we achieve rapid, shaped emission of entangled photon wavepackets. We leverage these capabilities to generate a 2D cluster state of four photons with 70% fidelity, as verified by tomographic reconstruction of the quantum state.
  arXiv  Detail & Related papers  (2022-06-21T02:08:18Z)
• Photonic resource state generation from a minimal number of quantum emitters [0.0]
  Multi-photon entangled graph states are a fundamental resource in quantum communication networks, distributed quantum computing, and sensing. Here, we present an algorithm that, given a desired multi-photon graph state, determines the minimum number of quantum emitters and precise operation sequences that can produce it.
  arXiv  Detail & Related papers  (2021-08-27T19:16:56Z)
• Single photon emission from individual nanophotonic-integrated colloidal quantum dots [45.82374977939355]
  Solution processible colloidal quantum dots hold great promise for realizing single-photon sources embedded into scalable quantum technology platforms. We report on integrating individual colloidal core-shell quantum dots into a nanophotonic network that allows for excitation and efficient collection of single-photons via separate waveguide channels.
  arXiv  Detail & Related papers  (2021-04-23T22:14:17Z)
• Generation of Photonic Matrix Product States with Rydberg Atomic Arrays [63.62764375279861]
  We show how one can deterministically generate photonic matrix product states with high bond and physical dimensions with an atomic array. We develop a quantum gate and an optimal control approach to universally control the system and analyze the photon retrieval efficiency of atomic arrays.
  arXiv  Detail & Related papers  (2020-11-08T07:59:55Z)
• Entanglement transfer, accumulation and retrieval via quantum-walk-based qubit-qudit dynamics [50.591267188664666]
  Generation and control of quantum correlations in high-dimensional systems is a major challenge in the present landscape of quantum technologies. We propose a protocol that is able to attain entangled states of $d$-dimensional systems through a quantum-walk-based it transfer & accumulate mechanism. In particular, we illustrate a possible photonic implementation where the information is encoded in the orbital angular momentum and polarization degrees of freedom of single photons.
  arXiv  Detail & Related papers  (2020-10-14T14:33:34Z)

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.