Monday 10 March 2025
Scientists have made a significant breakthrough in the field of quantum computing, developing a technique that allows them to control multiple qubits using a single microwave line. Qubits are the fundamental units of quantum information, and controlling them is crucial for the development of powerful quantum computers.
The new technique, called selective excitation pulse (SEP), uses cleverly designed pulses of energy to manipulate the qubits without disturbing other nearby qubits. This is particularly important as the number of qubits in a quantum computer increases, making it challenging to control them individually.
Traditional methods for controlling qubits involve using separate microwave lines for each qubit, which can be impractical and limited by the available space. The SEP technique overcomes this limitation by allowing multiple qubits to share a single microwave line, reducing the need for additional wiring and increasing the overall efficiency of the system.
The researchers achieved this feat by carefully designing the pulses of energy used to control the qubits. They developed a new type of pulse that can be tailored to specific frequencies, allowing them to selectively excite only the target qubit while leaving other nearby qubits unaffected.
To demonstrate the effectiveness of their technique, the scientists conducted experiments using three fixed-frequency transmon qubits, which are commonly used in quantum computing applications. They showed that by using SEP pulses, they could achieve single-qubit gate fidelities comparable to those obtained with conventional Gaussian pulses, while effectively suppressing unwanted excitations in non-target qubits.
The implications of this breakthrough are significant, as it paves the way for the development of more complex and powerful quantum computers. By allowing multiple qubits to be controlled using a single microwave line, SEP technology could lead to faster and more efficient processing times, making it an essential component of future quantum computing systems.
Furthermore, the technique has the potential to reduce the overall cost and complexity of building large-scale quantum computers. By eliminating the need for additional wiring and reducing the number of control lines required, SEP technology could make it more feasible to build larger and more powerful quantum computers.
In addition to its practical applications, the SEP technique also provides valuable insights into the fundamental physics underlying quantum computing. By studying the behavior of qubits in response to carefully designed pulses, researchers can gain a deeper understanding of the complex interactions between qubits and develop new strategies for controlling them.
As research continues to push the boundaries of what is possible with quantum computing, the SEP technique offers a promising avenue for advancing our knowledge and capabilities in this field.
Cite this article: “Breakthrough in Quantum Computing: Controlling Multiple Qubits Using a Single Microwave Line”, The Science Archive, 2025.
Quantum Computing, Qubits, Selective Excitation Pulse, Sep Technique, Microwave Line, Quantum Information, Transmon Qubits, Gaussian Pulses, Single-Qubit Gate Fidelities, Quantum Computers.
