Fully on-chip photonic turnkey quantum source for entangled qubit/qudit
state generation
- URL: http://arxiv.org/abs/2206.08715v1
- Date: Fri, 17 Jun 2022 12:14:21 GMT
- Title: Fully on-chip photonic turnkey quantum source for entangled qubit/qudit
state generation
- Authors: Hatam Mahmudlu, Robert Johanning, Anahita Khodadad Kashi, Albert van
Rees, J\"orn P. Epping, Raktim Haldar, Klaus-J. Boller, and Michael Kues
- Abstract summary: Integrated photonics has recently become a leading platform for the realization and processing of optical entangled quantum states in chip formats.
Here we demonstrate a fully integrated quantum light source, which overcomes these challenges through the combined integration of a laser cavity.
The hybrid quantum source employs an electrically-pumped InP gain section and a Si$_3$N$_4$ low-loss microring filter system.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Integrated photonics has recently become a leading platform for the
realization and processing of optical entangled quantum states in compact,
robust and scalable chip formats with applications in long-distance
quantum-secured communication, quantum-accelerated information processing and
non-classical metrology. However, the quantum light sources developed so far
have relied on external bulky excitation lasers making them impractical, not
reproducible prototype devices, hindering scalability and the transfer out of
the lab into real-world applications. Here we demonstrate a fully integrated
quantum light source, which overcomes these challenges through the combined
integration of a laser cavity, a highly efficient tunable noise suppression
filter ($> 55$ dB) exploiting the Vernier effect and a nonlinear microring for
entangled photon pair generation through spontaneous four-wave mixing. The
hybrid quantum source employs an electrically-pumped InP gain section and a
Si$_3$N$_4$ low-loss microring filter system, and demonstrates high performance
parameters, i.e., a pair emission over four resonant modes in the telecom band
(bandwidth $\sim 1$ THz), and a remarkable pair detection rate of $\sim 620$ Hz
at a high coincidence-to-accidental ratio of $\sim 80$. The source directly
creates high-dimensional frequency-bin entangled quantum states
(qubits/qudits), verified by quantum interference measurements with
visibilities up to $96\%$ (violating Bell-inequality) and by density matrix
reconstruction through state tomography showing fidelities of up to $99\%$. Our
approach, leveraging a hybrid photonic platform, enables commercial-viable,
low-cost, compact, light-weight, and field-deployable entangled quantum
sources, quintessential for practical, out-of-lab applications, e.g., in
quantum processors and quantum satellite communications systems.
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