Abstract
We study quantum state transfer between two qubits coupled to a common quantum bus that is constituted by an ultrastrong coupled light-matter system. By tuning both qubit frequencies on resonance with a forbidden transition in the mediating system, we demonstrate a high-fidelity swap operation even though the quantum bus is thermally populated. We discuss a possible physical implementation in a realistic circuit QED scheme that leads to the multimode Dicke model. This proposal may have applications on hot quantum information processing within the context of ultrastrong coupling regime of light-matter interaction.
Highlights
The exchange of information between nodes of a quantum network is a necessary condition for large-scale quantum information processing (QIP) and networking
We have shown that a system composed by two qubits connected to an incoherent quantum Rabi system (QRS) mediator, allows us to carry out high fidelity quantum state transfer (QST) of single-qubit states even though the mediator system is in a thermally populated state
The QST mechanism involves the tuning of qubit frequencies resonant to a parity forbidden transition in the QRS such that an effective qubit-qubit interaction appears
Summary
For the two-qubit quantum Rabi model we need to take into account additional features In this case, if one considers identical qubits and coupling strengths in the Hamiltonian (1), the spectrum features an invariant subspace formed by tensor products of pseudo spin and Fock states { ↓, ↑ , N , ↑, ↓ , N }, whose eigenstates are φN The selection rules in the two-qubit quantum Rabi system need to take into account the emergence of dark states In this case, each DS has definite parity as shown in Fig. 2(a); the matrix elements between a DS and linear superposit remaining states ions of product are s of null, sym mXφeNtkr. In the light of the above forbidden transitions, we will show that they become a key feature for our quantum state transfer protocol
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