University of Pittsburgh researchers have designed a modular quantum signal routing method. This method is based on parallel three-wave parametric coupling through a ‘tree’ of microwave elements. Further development of this novel routing method could result in large-scale router tree networks which could transform the area of quantum computing.
Description
Quantum computing is a growing area of research in physics with the potential to revolutionize the field of supercomputing, telecommunications and artificial intelligence including drug development and medical application. In quantum computing, individual quantum bits (qubits) are formed into an information processing network through the connection of bits, together resulting in logical register formation on which gates can be performed. Currently, there are challenges in developing methods of combining multiple qubits into large qubit machines. This novel modular quantum computing router could provide a superior method of signal routing than existing methods leading to the development of larger networks of qubits and more advanced quantum computing.
Applications
- Quantum computing
- Telecommunications
- Medical research
Advantages
Qubits require coherent quantum channels to transmit information, unlike classical bits where many configurations are possible, and information can be transported between distant bits. Developing long-distance qubit transport strategies is a limitation in current efforts to develop quantum computers. Current approaches in quantum computing use “Surface Code” where each qubit is connected to its four nearest neighbors.
This novel router contains qubit ‘modules’ which can store quantum information in a ‘communication cavity’ as a state of microwave light and can decay into a neighboring cavity via a transmission line in a process referred to as ‘pitch and catch’. The quantum router can connect various send and receive modules. To overcome challenges with signal loss and interference, a three-wave parametric interaction between modes in a microwave waveguide is used. This solution allows photons to ‘hop’ between the pair of coupled modes and even if there are several modes in the system these can operate in parallel without deleterious effects. This approach could allow for larger quantum networks to be built in a modular manner.
Invention Readiness
In silico experimentation has suggested a commercial waveguide cut to 5.14 inches in length produces eigenmodes of more than 100 MHz apart to prevent interference between qubits. Computational models of the router have been produced and physical testing and development is now required to confirm theoretical results.
IP Status
https://patents.google.com/patent/US20220269301A1
