Real-time observation of picosecond-timescale optical quantum entanglement toward ultrafast quantum information processing

• URL: http://arxiv.org/abs/2403.07357v1
• Date: Tue, 12 Mar 2024 06:32:20 GMT
• Title: Real-time observation of picosecond-timescale optical quantum entanglement toward ultrafast quantum information processing
• Authors: Akito Kawasaki, Hector Brunel, Ryuhoh Ide, Takumi Suzuki, Takahiro Kashiwazaki, Asuka Inoue, Takeshi Umeki, Taichi Yamashima, Atsushi Sakaguchi, Kan Takase, Mamoru Endo, Warit Asavanant, and Akira Furusawa
• Abstract summary: Entanglement is a fundamental resource of various optical quantum-information-processing (QIP) applications. We report real-time observation of ultrafast optical Einstein-Podolsky-Rosen correlation at a picosecond timescale in a continuous-wave (CW) system.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement is a fundamental resource of various optical quantum-information-processing (QIP) applications. Towards high-speed QIP system, entanglement should be encoded in short wavepackets. We report real-time observation of ultrafast optical Einstein-Podolsky-Rosen (EPR) correlation at a picosecond timescale in a continuous-wave (CW) system. Optical phase-sensitive amplification using 6-THz-bandwidth waveguide-optical-parametric amplifier enhances the effective efficiency of 70-GHz-bandwidth homodyne detectors, mainly used in 5th-generation telecommunication, enabling its use in real-time quantum-state measurement. While power measurement using frequency scanning, i.e., optical spectrum analyzer, is not performed in real-time, our observation is demonstrated through real-time amplitude measurement and can be directly employed in QIP applications. Observed EPR states show quantum correlation of 4.5 dB below shotnoise level encoded in wavepackets with 40-ps period, equivalent to 25-GHz repetition -- ${10^3}$ times faster than previous entanglement observation in CW system. The quantum correlation of 4.5 dB is already sufficient for several QIP applications, and our system can be readily extended to large-scale entanglement. Moreover, our scheme has high compatibility with optical communication technology such as wavelength-division multiplexing, and femtosecond-timescale observation is also feasible. Our demonstration is paradigm shift in accelerating accessible quantum correlation, the foundational resource of all quantum applications, from the nanosecond to picosecond timescale, enabling ultra-fast optical QIP.

Related papers

• All-optical measurement-device-free feedforward enabling ultra-fast quantum information processing [0.0]
  Optical circuit systems have the potential to perform quantum information processing (QIP) at higher clock rate than conventional processing. In this paper, we demonstrate a variable squeezing gate with a clock rate of 1.3 THz by all-optical measurement-device-free feedforward.
  arXiv  Detail & Related papers  (2024-10-28T02:52:30Z)
• Purifying quantum-dot light in a coherent frequency interface [39.58317527488534]
  Quantum networks operate in the telecom wavelengths to take advantage of low-loss transmission in optical fibres. Bright quantum dots (QDs) emitting highly indistinguishable quantum states of light, such as InGaAs QDs, often emit photons in the near infrared. We report a method for simultaneously implementing spectral purification and frequency shifting of single photons from QD sources to the C-band in a periodically poled Lithium Niobate waveguide.
  arXiv  Detail & Related papers  (2024-07-11T18:02:43Z)
• Generation of multi-photon Fock states at telecommunication wavelength using picosecond pulsed light [0.0]
  In this paper, we report the first generation of picosecond pulsed multi-photon Fock states (single-photon and two-photon states) in the C-band with Wigner negativities. Our setup is anticipated to serve as a prototype of a high-speed optical quantum state generator for ultrafast quantum information processing at telecommunication wavelength.
  arXiv  Detail & Related papers  (2024-05-10T16:12:00Z)
• QuantumSEA: In-Time Sparse Exploration for Noise Adaptive Quantum Circuits [82.50620782471485]
  QuantumSEA is an in-time sparse exploration for noise-adaptive quantum circuits. It aims to achieve two key objectives: (1) implicit circuits capacity during training and (2) noise robustness. Our method establishes state-of-the-art results with only half the number of quantum gates and 2x time saving of circuit executions.
  arXiv  Detail & Related papers  (2024-01-10T22:33:00Z)
• Hyper-entanglement between pulse modes and frequency bins [101.18253437732933]
  Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols. We demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins.
  arXiv  Detail & Related papers  (2023-04-24T15:43:08Z)
• Interfacing picosecond and nanosecond quantum light pulses [0.0]
  We develop a large-aperture time lens using complex high-bandwidth electro-optic phase modulation. We demonstrate coherent, deterministic spectral bandwidth compression of quantum light pulses by more than two orders of magnitude with high efficiency.
  arXiv  Detail & Related papers  (2022-11-09T18:59:01Z)
• Time-resolved Hanbury Brown-Twiss interferometry of on-chip biphoton frequency combs using Vernier phase modulation [0.0]
  Biphoton frequency combs (BFCs) are promising quantum sources for large-scale and high-dimensional quantum information and networking systems. Measurement of the temporal auto-correlation function of the unheralded signal or idler photons comprising the BFC is a key tool for characterizing their spectral purity. We propose a scheme to circumvent this challenge through electro-optic phase modulation.
  arXiv  Detail & Related papers  (2022-10-11T17:08:22Z)
• 43-GHz bandwidth real-time amplitude measurement of 5-dB squeezed light using modularized optical parametric amplifier with 5G technology [0.0]
  Homodyne detectors for quadrature-phase amplitude measurements have been the major factor limiting the clock frequency. We developed a real-time amplitude measurement method using a modular optical parametric amplifier (OPA) and a broadband balanced photodiode. The marriage of CVOQIP and 5G technology arranged by the modular OPA will lead to a paradigm shift from the conventional method of using stationary qubits.
  arXiv  Detail & Related papers  (2022-05-27T15:47:38Z)
• A Frequency-Multiplexed Coherent Electro-Optic Memory in Rare Earth Doped Nanoparticles [94.37521840642141]
  Quantum memories for light are essential components in quantum technologies like long-distance quantum communication and distributed quantum computing. Recent studies have shown that long optical and spin coherence lifetimes can be observed in rare earth doped nanoparticles. We report on coherent light storage in Eu$3+$:Y$$O$_3$ nanoparticles using the Stark Echo Modulation Memory (SEMM) quantum protocol.
  arXiv  Detail & Related papers  (2020-06-17T13:25:54Z)
• Spectrally reconfigurable quantum emitters enabled by optimized fast modulation [42.39394379814941]
  Spectral control in solid state platforms such as color centers, rare earth ions, and quantum dots is attractive for realizing such applications on-chip. We propose the use of frequency-modulated optical transitions for spectral engineering of single photon emission. Our results suggest that frequency modulation is a powerful technique for the generation of new light states with unprecedented control over the spectral and temporal properties of single photons.
  arXiv  Detail & Related papers  (2020-03-27T18:24:35Z)
• Frequency-Domain Quantum Interference with Correlated Photons from an Integrated Microresonator [96.25398432840109]
  We report frequency-domain Hong-Ou-Mandel interference with spectrally distinct photons generated from a chip-based microresonator. Our work establishes four-wave mixing as a tool for selective high-fidelity two-photon operations in the frequency domain.
  arXiv  Detail & Related papers  (2020-03-14T01:48:39Z)

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.