Polarization entanglement purification of nonlocal microwave photons based on the cross-Kerr effect in circuit QED

Abstract

Microwave photons have become very important qubits in quantum communication as the first quantum satellite has been launched successfully. Therefore, it is a necessary and meaningful task for ensuring the high security and efficiency of microwave-based quantum communication in practice. Here, we present an original polarization entanglement purification protocol for nonlocal microwave photons based on the cross-Kerr effect in circuit quantum electrodynamics (QED). Our protocol can solve the problem that the purity of maximally entangled states used for constructing quantum channels will decrease due to decoherence from environment noise. This task is accomplished by means of the polarization parity-check quantum nondemolition (QND) detector, the bit-flipping operation, and the linear microwave elements. The QND detector is composed of several cross-Kerr effect systems which can be realized by coupling two superconducting transmission line resonators to a superconducting molecule with the N-type level structure. We give the applicable experimental parameters of QND measurement system in circuit QED and analyze the fidelities. Our protocol has good applications in long-distance quantum communication assisted by microwave photons in the future, such as satellite quantum communication.

11 pages, 6 figures

References in corpus (18)

• Charge insensitive qubit design derived from the Cooper pair box
• Coupling Superconducting Qubits via a Cavity Bus
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Resolving photon number states in a superconducting circuit
• Quantum information processing with circuit quantum electrodynamics
• Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations
• Generating Single Microwave Photons in a Circuit
• Efficient quantum key distribution over a collective noise channel
• Efficient polarization entanglement purification based on parametric down-conversion sources with cross-Kerr nonlinearity
• Quantum Non-demolition Detection of Single Microwave Photons in a Circuit
• One-step deterministic polarization entanglement purification using spatial entanglement
• Nonlocal entanglement concentration scheme for partially entangled multipartite systems with nonlinear optics
• Deterministic entanglement of photons in two superconducting microwave resonators
• One-step error correction for multipartite polarization entanglement
• Two-step hyperentanglement purification with the quantum-state-joining method
• Giant Kerr nonlinearities in Circuit-QED
• Hyperentanglement purification for two-photon six-qubit quantum systems
• Deterministic Generation of Entangled Photons in Superconducting Resonator Arrays