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Robust Manipulation of Quantum Entanglement

It is well-known that the failure to isolate a quantum system leads to decoherence, which destroys resources essential for quantum information processing, such as quantum entanglement.

In this work, we propose a scheme that counterintuitively uses dissipation, through hot and cold environments, to generate highly entangled states between two qubits (quantum bits). By controlling the direction of the dissipation in either a clockwise or counterclockwise manner, our method can deterministically drive the system into a desired entangled state, starting from any initial separable state. Our scheme provides a novel way to harness dissipation, which is normally an obstacle to preserving coherence and entanglement, as a resource for quantum control and entanglement generation. The ideas we present can be generalized to larger systems involving multipartite and high-dimensional entanglement. Furthermore, our proposal is feasible for immediate experimental testing in circuit QED platforms with bath engineering techniques. Our work makes an essential step towards exploiting non-Hermitian dynamics in quantum technologies and opens up exciting possibilities for dissipation engineering in quantum information processing.