Kavli Affiliate: Simon Groblacher
| First 5 Authors: , , , ,
| Summary:
Integrated photonics has revolutionized fields such as telecommunications,
quantum optics, and metrology by enabling compact, scalable circuits through
highly confined optical modes. Within the field of quantum acoustics, phonons
have emerged as a compelling alternative, offering advantages such as lower
energy, smaller mode volume, and low propagation speeds, which make them ideal
for interfacing diverse quantum systems. Developing integrated phononic
circuits is thus essential for unlocking the full potential of quantum
acoustics and advancing technologies such as quantum computing and hybrid
systems. In this work, we demonstrate the first 4-port directional coupler for
quantum mechanical excitations – a key building block for phononic circuits. By
tuning the coupling region length, we achieve phononic beam splitters with
controllable splitting ratios. We validate quantum-level performance by sending
a single-phonon Fock state through the device. This work represents a
foundational advance toward scalable, integrated phononic platforms for both
classical and quantum applications.
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