Reconfigurable quantum photonic circuits based on quantum dots
arxiv(2023)
摘要
Quantum photonic integrated circuits, composed of linear-optical elements,
offer an efficient way for encoding and processing quantum information on-chip.
At their core, these circuits rely on reconfigurable phase shifters, typically
constructed from classical components such as thermo- or electro-optical
materials, while quantum solid-state emitters such as quantum dots are limited
to acting as single-photon sources. Here, we demonstrate the potential of
quantum dots as reconfigurable phase shifters. We use numerical models based on
established literature parameters to show that circuits utilizing these
emitters enable high-fidelity operation and are scalable. Despite the inherent
imperfections associated with quantum dots, such as imperfect coupling,
dephasing, or spectral diffusion, our optimization shows that these do not
significantly impact the unitary infidelity. Specifically, they do not increase
the infidelity by more than 0.001 in circuits with up to 10 modes, compared to
those affected only by standard nanophotonic losses and routing errors. For
example, we achieve fidelities of 0.9998 in quantum-dot-based circuits enacting
controlled-phase and -not gates without any redundancies. These findings
demonstrate the feasibility of quantum emitter-driven quantum information
processing and pave the way for cryogenically-compatible, fast, and low-loss
reconfigurable quantum photonic circuits.
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