Remote Entanglement Generation Via Enhanced Quantum State Transfer

Achieving robust and scalable remote quantum entanglement is one of the fundamental challenges for the development of distributed quantum networks and modular quantum computing systems. In this context, perfect state transfer (PST) and fractional state transfer (FST) have emerged as promising schemes for quantum state transfer and remote entanglement generation using only nearest-neighbor couplings. In this work, we propose a quantum state transfer scheme based on a zig-zag configuration, which introduces a control parameter for PST and FST. We show that this new parameter can suppress the population in the intermediate qubits, thereby reducing losses and enhancing state transfer. In certain limiting cases, our new scheme reduces to the conventional PST scheme, revealing an elegant mathematical structure inherent in the design. We experimentally demonstrate our proposed scheme on a superconducting quantum processor, achieving an 18% reduction in error for remote Bell state generation in a 1D ( <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mn>1</a:mn> <a:mo>×</a:mo> <a:mn>5</a:mn> </a:math> ) qubit chain with enhanced robustness to specific noise channels. Furthermore, we extend our approach to a 2D ( <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mn>3</c:mn> <c:mo>×</c:mo> <c:mn>3</c:mn> </c:math> ) network and successfully generate a <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:mrow> <e:mi mathvariant="script">W</e:mi> </e:mrow> </e:math> state among the four corner qubits. These results highlight the potential of our new enhanced quantum state transfer scheme for scalable and noise-resilient quantum communication and computing.