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Scalable Photonic Quantum Computer Design
Stanford Reference:
20-399
Abstract
Researchers at Stanford University have designed a scalable photonic quantum computer which does not require single-photon detectors and which uses minimal quantum resources: one coherently controlled atom. Photonics offers many advantages over superconducting systems as a platform for quantum computing, but it typically lacks scalability since machine size scales with quantum circuit depth. The Fan Group’s design (Figure 1) uses a single atomic qubit controlled by a laser to indirectly manipulate the state of a large number of photonic qubits which counter-propagate through a fiber optic ring. Any quantum circuit can be deterministically implemented by this device, and readout of the quantum state is not limited by the low efficiencies of single-photon detectors. Unlike most designs for photonic quantum computers, the physical size of this device is independent of quantum circuit depth. This scheme has high fidelity even in the presence of realistic experimental imperfections and is significantly simpler and less resource-intensive than existing paradigms for photonic quantum computing.
Figure 1. Architecture for a scalable photonic quantum computer
Courtesy of The Fan Group
Stage of Development
– Proof of Concept
The system concept has been proven theoretically and next steps are to build an apparatus.
Applications
Quantum computing
Advantages
Scalable
: for a fixed number of qubits, the physical size of this design is independent of the depth of the circuit to be implemented
Experimentally simple
: only one controllable qubit is needed, bypassing the challenge of integrating many quantum gates or identical quantum emitters into a single device
Does not require single-photon detectors
, which are a significant limitation for photonic quantum computers
Deterministic
, and thus less resource intensive than cluster-state, measurement-based, or linear-optical quantum computing schemes
Publications
Bartlett et al. arXiv (2020)
"Deterministic photonic quantum computation in a synthetic time dimension"
Related Web Links
The Fan Group
Innovators & Portfolio
Ben Bartlett
Avik Dutt
more technologies from Avik Dutt »
Shanhui Fan
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Patent Status
Published Application: WO2022076982
Published Application: 20230376817
Date Released
12/6/2020 12:00
Licensing Contact
Luis Mejia, Senior Licensing Manager, Physical Sciences
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Related Keywords
PS: quantum computing