Preparation of entangled states in multiple cavities

Abstract

A scheme is proposed for the preparation of entangled states in a pair of cavities, including Knill-Lafamme-Milburn (KLM) states and Bell states. Success probabilities for preparation of entangled states are near unity. The numerical simulation result shows that this scheme has high fidelity and is robust against imperfect operation. The obvious advantage is both the KLM states and Bell states can be prepared by setting the Rabi frequencies of the classical laser field or the interaction time between atom and classical laser field, and therefore, this scheme has high controllability. Furthermore, the n-cavity entangled states could be prepared with the same principle, which provides a scalable way to prepare entangled states in theory.

Generation of Multiparticle Knill‐Laflamme‐Milburn States in Circuit QED via Counter‐Rotating Interactions

“…Then, we tune 𝛿 1 so that 𝜉 010 = 𝜉 000 and acquire 𝛿 p = 𝜉 011 − 𝜉 001 and 𝛿 q = 𝜉 111 − 𝜉 101 . According to Equation (27), after flipping the states of the qubit 1 in |𝜑 III ⟩ synchronously, the system evolves to…”

“…[20,21] That is, similar to encoding in the W states, [11] when any qubit is measured by the bath, the entanglement among the remaining qubits still survives. Due to the above features, many protocols for generating the KLM states have been proposed based on various physical platforms, such as optics system, [22][23][24][25][26] atomcavity quantum electronic dynamics (QED) system, [27][28][29] and Rydberg atoms. [20,[30][31][32] Nevertheless, due to the complex form of the KLM states, few protocols have been proposed to generate multiparticle KLM states in solid-state systems.…”

Generation of an arbitrary logic W state with cross-Kerr nonlinearities

“…As a unique feature of quantum mechanics, entanglement is an important source in quantum information processing. During the past few decades, entanglement has been widely used in many branches of quantum communication and quantum computation, such as quantum teleportation [1][2][3][4][5], quantum key distribution [6], quantum secure direct communication [7][8][9][10][11][12][13], and some other important applications [14][15][16][17][18][19][20][21]. In practical applications, we often require the perfect maximally entangled state.…”

Engineering Knill–Laflamme–Milburn Entanglement via Dissipation and Coherent Population Trapping in Rydberg Atoms

“…[15] Another essential feature is that its entanglement is highly robust against the qubit loss, even in the absence of anyone of qubits, the remaining particles are still entangled, as opposed to a usual Greenberger-Horne-Zeilinger state. [16,17] Since then, much effort has been devoted to preparation of the KLM-type quantum entanglement with different physical platforms, e.g., linear optics, [18] atom-cavity quantum electrodynamics, [19][20][21] nonlinear cross-Kerr medium, [22] and artificial atom. [23] Moreover, direct conversion from other kinds of entanglement to a KLM state is also an interesting issue for the state preparation, which has been achieved in atomic, ionic, and optical systems.…”