Credit: AMD There are two main obstacles on the road to quantum development and eventual quantum supremacy. : scalability and stability. Quantum states are fickle matter, so sensitive that it can lose coherence at the slightest instability and the sensitivity of a quantum system tends to increase with the presence of more qubits in a given system. The AMD patent, titled "Look Ahead Teleportation for Reliable Computation in Multi-SIMD Quantum Processor," aims to improve quantum stability, scalability and performance in new and more efficient ways. It describes a quantum architecture based on quantum processing regions: areas of the chip that contain or may contain qubits, awaiting their turn on the processing pipeline. AMD's approach aims to improve existing quantum architectures by effectively reducing the number of qubits needed to perform complex calculations, through the concept of quantum tele transport.
AMD's design aims to tele-transport qubits across all regions, allowing workloads that theoretically require in-order execution to be processed with an out-of-order approach. Recall that in-order execution has dependencies between one statement and the next, which means that a workload must be processed sequentially, with subsequent steps depending on the complete processing of the previous step and its result must be known before the chip can proceed. As you can imagine, there are resources (in this case, qubits) that remain inactive until it is time to move on to the next computation. On the other hand, out-of-order execution analyzes a given workload, identifies which parts of it depend on previous results and which do not, and executes each step of the statement that does not require a previous result, thus improving performance. through greater parallelism.
credit: unsplash.com AMD's patent also includes a look-ahead processor integrated into the architecture, which has the task of analyzing the input workload, predicting which steps can be addressed in parallel and adequately distributes the workload among the qubits, using a quantum tele transport technique to send them to the required quantum processing, based on SIMD regions. The way in which this quantum tele transport takes place is not described in the patent.
For the moment, of course, we just have to wait several more months to find out what awaits us for the future of Quantum Computing.