All-optical phase-sensitive detection for ultra-fast quantum computation

Abstract

Phase-sensitive detection is the essential projective measurement for measurement-based continuous-variable quantum information processing. The bandwidth of conventional electrical phase-sensitive detectors is up to several gigahertz, which would limit the speed of quantum computation. It is theoretically proposed to realize terahertz-order detection bandwidth by using all-optical phase-sensitive detection with an optical parametric amplifier (OPA). However, there have been experimental obstacles to achieve large parametric gain for continuous waves, which is required for use in quantum computation. Here, we adopt a fiber-coupled ${\chi }^{(2)}$ OPA made of a periodically poled LiNbO${}_3$ waveguide with high durability for intense continuous-wave pump light. Thanks to that, we manage to detect quadrature amplitudes of broadband continuous-wave squeezed light. 3 dB of squeezing is measured up to 3 THz of sideband frequency with an optical spectrum analyzer. Furthermore, we demonstrate the phase-locking and dispersion compensation of the broadband continuous-wave squeezed light, so that the phase of the squeezed light is maintained over 1 THz. The ultra-broadband continuous-wave detection method and dispersion compensation would help to realize all-optical quantum computation with over-THz clock frequency.

arXiv comment7 pages, 6 figures, a typo in metadata fixed

References in corpus (20)

• Monolithic Ultrahigh-Q Lithium Niobate Microring Resonator
• Time-Domain Multiplexed 2-Dimensional Cluster State: Universal Quantum Computing Platform
• Deterministic generation of a two-dimensional cluster state
• Quantum teleportation of light beams
• Generation of one-million-mode continuous-variable cluster state by unlimited time-domain multiplexing
• Detection loss tolerant supersensitive phase measurement with an SU(1,1) interferometer
• An On-chip Homodyne Detector for Measuring Quantum States and Generating Random Numbers
• Continuous-wave 6-dB-squeezed light with 2.5-THz-bandwidth from single-mode PPLN waveguide
• 1.2 GHz Balanced Homodyne Detector for Continuous-Variable Quantum Information Technology
• Chip-based squeezing at a telecom wavelength
• High-bandwidth squeezed light at 1550 nm from a compact monolithic PPKTP cavity
• Squeezing at 946nm with periodically-poled KTiOPO_4
• Creation and Measurement of Broadband Squeezed Vacuum from a Ring Optical Parametric Oscillator
• Generation of continuous-wave broadband Einstein-Podolsky-Rosen beams using periodically-poled lithium niobate waveguides
• Wide-field SU(1,1) interferometer
• 500MHz resonant photodetector for high-quantum-effciency, low-noise homodyne measurement
• 4-dB quadrature squeezing with fiber-coupled PPLN ridge waveguide module
• Measuring the continuous variable quantum entanglement with a parametric amplifier assisted homodyne detection
• Excess Loss in Homodyne Detection Originating from Distributed Photocarrier Generation in Photodiodes
• Octave-Spanning Phase Control for Single-Cycle Bi-Photons

Cited by in corpus (23)

• Few-cycle vacuum squeezing in nanophotonics
• Fabrication of low-loss quasi-single-mode PPLN waveguide and its application to a modularized broadband high-level squeezer
• A fault-tolerant continuous-variable measurement-based quantum computation architecture
• One-hundred step measurement-based quantum computation multiplexed in the time domain with 25 MHz clock frequency
• Over-8-dB squeezed light generation by a broadband waveguide optical parametric amplifier toward fault-tolerant ultra-fast quantum computers
• 43-GHz bandwidth real-time amplitude measurement of 5-dB squeezed light using modularized optical parametric amplifier with 5G technology
• Scalable photonic platform for real-time quantum reservoir computing
• Building a large-scale quantum computer with continuous-variable optical technologies
• Quantum nondemolition measurements with optical parametric amplifiers for ultrafast universal quantum information processing
• Wigner Function Tomography via Optical Parametric Amplification
• Generation of Schrödinger cat states with Wigner negativity using continuous-wave low-loss waveguide optical parametric amplifier
• Generation of Flying Logical Qubits using Generalized Photon Subtraction with Adaptive Gaussian Operations
• Mesoscopic ultrafast nonlinear optics -- The emergence of multimode quantum non-Gaussian physics
• Real-time observation of picosecond-timescale optical quantum entanglement toward ultrafast quantum information processing
• Quantum arbitrary waveform generator
• Strong nanophotonic quantum squeezing exceeding 3.5 dB in a foundry-compatible Kerr microresonator
• Nonlinear Domain Engineering for Quantum Technologies
• All-optical measurement-device-free feedforward enabling ultra-fast quantum information processing
• Amplified Squeezed States: Analyzing Loss and Phase Noise
• An All-Optical General-Purpose CPU and Optical Computer Architecture
• Ultrashort-pulse-pumped, single-mode type-0 squeezers in lithium niobate nanophotonics
• Completely characterizing multimode nonlinear-optical quantum processes
• Practical Limits on Integrated Squeezers