Entanglement Purification for Mixed Entangled Quantum Dot States via Superconducing Transmission Line Resonators

Chuan Xi Wang, Ru Zhang, Yong Zhang +1 more

Dong Ping, Zhang Gang, Zhuo‐Liang Cao

An entanglement purification protocol for mixed entangled states is presented via double quantum dot molecules inside a superconducing transmission line resonator (TLR). In the current scenario, coupling for arbitrary double quantum dot molecules can be tuned via the TLR in the large detuning region by controlling the qubit level splitting. The TLR is always empty and only virtually excited, so the interaction is insensitive to both the TLR decay and thermal field. Discussion about the feasibility of our scheme shows that the entanglement purification can be implemented with high fidelity and successful probability.

Zhuo‐Liang Cao

Coupling and controlling between arbitrary two double quantum dot molecules can be implemented using quantum dot molecular and superconducting transmission line resonator (STLR). In the large detuning region,the interaction is insensitive to both the STLR decay and thermal field. Finally,a scheme for entanglement concentration with successfully probability 50% is proposed.

Sophia E. Economou

Peishun Yan, Lan Zhou, Wei Zhong +1 more

Zhirong Lin, Guo‐Ping Guo, Tao Tu +2 more

We propose an efficient method to generate cluster states in spatially separated double quantum dots with a superconducting transmission line resonator. When the detuning between the double-dot qubit transition frequency and the frequency of the full wave mode in the transmission line resonator satisfies some conditions, an Ising-like operator between an arbitrary two separated qubits can be achieved. Even including the main noise sources, it is shown that the high fidelity cluster states could be generated in this solid system in just one step.