Gaussian Boson Sampling via Time-Multiplexed Squeezed Vacuum States
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Solution Overview
Problem
Boson sampling experiments face challenges in achieving quantum supremacy due to imperfections such as loss, distinguishability of photons, and experimental noise, which are exacerbated by the need for complex setups with many non-classical optical sources and detectors, leading to inefficiencies and noise generation.
Innovation Solution
A system utilizing time multiplexing of squeezed vacuum states through optical components like beam splitters and delay lines, combined with homodyne detection and photon counting, to reduce the number of components and minimize noise, enabling efficient Gaussian boson sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single photon sources are used for boson sampling, then quantum supremacy can be demonstrated, but the experimental setup becomes complex and noise increases due to the need for many non-classical optical sources and detectors
Solution Approach 1:
The patent merges multiple single photon sources into a single squeezed vacuum source. By using one optical parametric oscillator to generate squeezed vacuum states that are then distributed through the interferometer, the system eliminates the need for multiple independent non-classical sources, thereby reducing setup complexity while maintaining the quantum correlations necessary for boson sampling
Solution Approach 2:
The squeezed vacuum source serves multiple functions: it generates the non-classical input states for the interferometer, provides the quantum correlations necessary for boson sampling, and can be distributed to multiple modes through the optical network. This multi-functional approach replaces what would otherwise require multiple specialized single photon sources
2Productivity
If the number of photons is increased to achieve quantum supremacy, then computational complexity increases exponentially, but photon losses and experimental errors also increase
Solution Approach 1:
The patent changes the statistical parameters of the input states from single photon Fock states to squeezed vacuum states with Gaussian statistics. This parameter change allows the system to achieve the necessary quantum complexity for boson sampling while using states that are more robust to losses and can be generated with higher efficiency, thereby reducing photon losses even as the system size increases
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces photon losses and computational requirements, making it feasible to achieve quantum supremacy with a simpler and more efficient experimental setup.
Implementation Method 1
an optical input generator configured for generating squeezed vacuum states
Implementation Method 2
correlating the first part of the squeezed vacuum states from the first optical line and the second part of the squeezed vacuum states from the second optical line using a plurality of beam splitters
Implementation Method 3
delaying the optical inputs in the second optical line using a number of delay lines located between the plurality of beam splitters
Implementation Method 4
measuring a property of the optical inputs using a homodyne detector at the end of the first optical line
Implementation Method 5
applying displacement operations to the optical inputs in the second optical line
Implementation Method 6
counting the optical inputs at the end of the second optical line
Data Source
AI summary
The present disclosure relates to a system and a method of performing Gaussian boson sampling via time multiplexing correlation of squeezed vacuum states for quantum information experiments. One embodiment relates to a method for performing Gaussian boson sampling comprising the steps of—generating a set of pulsed pairs of squeezed vacuum states,—performing time 2024/038212 multiplexed correlation of multiple of such pairs of squeezed vacuum states,—measuring, via a homodyne detection, a state from the pairs of generated squeezed vacuum states,—feed-forwarding the homodyne result of the measured states to a displacement unit,—performing displacement operations on the remaining state from the pairs of generated squeezed vacuum states, and—counting the states output from the displacement unit.