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This theoretical study examines two quantum bits (qubits) inside a light cavity driven by a two-photon drive, finding that strongly coupled qubits produce hyperradiance—an enhanced collective light emission that serves as a detectable signature of quantum entanglement between the qubits. The researchers quantified this entanglement using concurrence measurements and demonstrated that adding a Kerr-nonlinear medium to the cavity creates two-photon blockade effects. The system could potentially function as a source of both hyperradiant and quadrature-squeezed two-photon light.
Why it matters
This research advances the development of quantum light sources with specific properties useful for quantum communication and quantum computing applications. The ability to generate entangled photon pairs with controlled emission characteristics could improve quantum information processing systems and secure communication protocols.
arXiv:2403.13717v4 Announce Type: replace
Abstract: We theoretically study the radiance properties of a pair of qubits inside a single-mode cavity driven by a two-photon drive. Our results show that, when the two qubits are strongly coupled to the cavity field, the collective radiation emitted from the qubits exhibits hyperradiance which can be detected as a signature of two qubit entanglement in the weak-driving regime. We quantify the entanglement in terms of concurrence. Additionally, we study the radiance behaviour in the presence of an intracavity Kerr-nonlinear medium that leads to two-photon blockade. Our results suggest that this system with nonlinearity may act as a quadrature-squeezed and hyperradiant two-photon source.
Source: Hyperradiance, photon blockade and concurrence in a pair of qubits inside a driven cavity