10-GHz-clock time-multiplexed non-degenerate optical parametric oscillator network with a variable planar lightwave...

Area of Science:

• Quantum simulation
• Condensed matter physics
• Nonlinear optics

Background:

• The XY model is a fundamental model in statistical mechanics, crucial for understanding magnetism and phase transitions.
• Physical spin simulators offer a pathway to study complex quantum systems intractable for classical computers.
• Non-degenerate optical parametric oscillators (NOPOs) provide a platform for continuous-variable quantum information processing.

Purpose of the Study:

• To demonstrate a large-scale physical spin simulator for the XY model.
• To achieve precise control over the effective temperature of a spin network.
• To explore the capabilities of coherent XY machines (CXYM) for quantum simulation.

Main Methods:

• Utilized non-degenerate optical parametric oscillators (NOPOs) to represent XY spins.
• Generated >47,000 spins using 10-GHz-clock time-multiplexed NOPO pulses via four-wave mixing in a nonlinear fiber ring cavity.
• Implemented unidirectional coupling with a variable 1-pulse delay planar lightwave circuit interferometer to control spin interactions.

Main Results:

• Successfully demonstrated a large-scale coherent XY machine (CXYM) with over 47,000 spins.
• Achieved control over the effective temperature of a one-dimensional XY spin network across two orders of magnitude.
• Validated the CXYM's capability to simulate the XY model with high fidelity.

Conclusions:

• The developed CXYM represents a significant advancement in scalable quantum simulation.
• This platform enables the study of complex spin systems and their emergent properties.
• The precise temperature control opens new avenues for exploring quantum phenomena in XY spin networks.