“Double-Transmon Coupler”, this is the name given by Toshiba to a project that thinks about the future. With superfast accurate quantum computers
Toshiba Corporation researchers have reached a historically important turning point in the architecture of the quantum computers: the basic design of a “double transmon “ (double-transmon) promises sparks, at the moment the idea is that it will improve the speed and accuracy of quantum computing in tunable couplers. The coupler, we recall, is a key device for determining the performance of superconducting quantum computers.
The tunable couplers of a quantum computer called a “superconductor” connect two qubits and perform quantum calculations by turning the coupling between them on and off. Current technology is capable of disabling the coupling of transmon qubits with close frequencies, but is prone to crosstalk errors that occur on one of the qubits when the other qubit is irradiated with electromagnetic waves for control. Furthermore, current technology cannot completely disable coupling for qubits with significantly different frequencieswith consequent errors due to residual coupling.
The innovation that Toshiba is going through should remedy this problem, let’s see it in detail.
Toshiba thinks big: development of “super” quantum computers begins
Toshiba therefore, which has devised a double transmon coupler, will be able to act on the current flaw, will be able to activate and completely deactivate the coupling between qubits with significantly different frequencies.
Full activation allows for high-speed quantum computations with strong coupling, while full deactivation eliminates residual coupling, improving the speed and accuracy of quantum computations. The simulations carried out with the new technology have shown that it allows to realize two-qubit gates, fundamental operations in quantum computation, with 99.99% accuracy and a processing time of only 24 ns.
Toshiba’s dual transmon coupler can be applied to fixed frequency qubit transmon, realizing high stability and ease of design. It is the first to realize the coupling between qubit transmon a fixed frequency with significantly different frequencies that can be fully activated and off and to provide an accurate, high-speed two-qubit gate.
Tunable couplers meet contradictory requirements: A fast two-qubit gate with strong coupling, along with the ability to reduce errors due to residual coupling by switching off the coupling.
Furthermore, it is preferable that the qubit used in the calculations is a fixed frequency qubit transmon, which is highly stable, it has a simple structure and is easy to manufacture. Furthermore, the frequency of the two paired qubits should be significantly different, as it reduces crosstalk errors and is robust against deviations from the design values of the qubit frequencies, thus improving the yield in device fabrication. The problem, however, is that no tunable coupler is yet capable of combining a full coupling and fast two-qubit gate operations for two fixed-frequency transmon qubits with significantly different frequencies.
This technology is expected to advance the development of quantum computers higher performance than they will contribute in areas such as achieving carbon neutrality and developing new drugs. Thanks to the incredible amount of data that will be able to grind such a system. If you want to continue to know the latest news from the hardware world, keep following us. Greetings from TechGameWorld.com.
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