Technology Detail


The Office of Technology Licensing was established in 1970 to transfer technologies developed at Stanford. Find out more about OTL's history, mission, staff, and statistics.



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



Related Web Links



Innovators & Portfolio



Date Released

 12/6/2020 12:00
 

Licensing Contact


Scott Elrod, Associate Director
Request Info

[-] Map/Timeline

09-427 An integrable, electrically pumped photonic crystal nanocavity
11-487 All Optical Random Bit Generator
12-191 Efficient, Low-Threshold Germanium Laser for Easy Integration of Optical Interconnects

more technologies »

Related Keywords


quantum computing