We propose a mechanism to engineer an $n$-photon blockade in nonlinear cavity with parametric drive $\lambda(\hat{a}^{\dag n}+\hat{a}^n)$. When $n$-photon-excitation resonance condition is satisfied, the presence of n photons suppresses absorption subsequent photons. To confirm validity this proposal, we study n-photon atom-cavity system, Kerr-nonlinear resonator, and two-coupled Kerr resonators. Our results demonstrate that bunching $(n+1)$-photon antibunching can be simultaneously obtained...

Non-Hermitian parity-time ($\mathcal{PT}$) and anti-parity-time ($\mathcal{APT}$)-symmetric systems exhibit novel quantum properties have attracted increasing interest. Although many counterintuitive phenomena in $\mathcal{PT}$- $\mathcal{APT}$-symmetric were previously studied, coherence flow has been rarely investigated. Here, we experimentally demonstrate single-qubit using an optical setup. In the symmetry unbroken regime, observe different periodic oscillations of coherence....

Quantum conversion between microwave and optical photons is an important area of quantum information science technology. Here we propose a one-step method to realize coherent cavity utilizing nitrogen-vacancy center ensemble (NV ensemble). An NV considered here acts as transducer, dispersively coupled the cavities, enabling transfer state generating entangled states cavities. With state-of-the-art technology, numerical simulation performed demonstrate that cat Fock can be high-fidelity...

In the past years, many efforts have been made to study various noteworthy phenomena in both parity-time ($\mathcal{PT}$) and anti-parity-time ($\mathcal{APT}$) symmetric systems. However, entanglement dynamics $\mathcal{APT}$-symmetric systems has not previously investigated theory experiments. Here, we investigate evolution of two qubits an system. unbroken regime, our theoretical simulations demonstrate periodic oscillations when each qubit evolves identically, while nonperiodic...

Wave-particle duality relations are fundamental for quantum physics. Previous experimental studies of mainly focus on the quadratic relation $D^2+V^2\leq1$, based symmetric beam interference, while a linear form relation, predicated earlier theoretically, has never been experimentally tested. In addition, difference between and not explored yet. this work, with designed asymmetric interference by utilizing polarization degree freedom photon as which-way detector, we confirm both forms...

Hybrid entanglement between particlelike and wavelike optical qubits has drawn increasing attention because such hybrid is a key resource in establishing quantum networks connecting processors with different encoding qubits. For convenience, we define ``particlelike qubits'' as PO ``wavelike WO In this work, propose method to create Greenberger-Horne-Zeilinger (GHZ) entangled state of $n$ qubits, by using $2n$ microwave cavities coupled superconducting flux qutrit. The two logic states qubit...

Abstract Realizing strong optomechanical interaction at a few‐photon level is one of the most significant tasks in physics. In this paper, an efficient approach to realize enhanced optomechanical‐like coupling cross‐Kerr‐type coupled three‐mode optical cavity system via driving field presented. It shown that can be strongly enter ultrastrong‐coupling regime, and effects damping effectively restrained by adjusting frequencies. addition, as application multimode quantum system, scheme propsed...

Nonorthogonal quantum state discrimination (QSD) plays an important role in information and communication. In addition, compared to Hermitian systems, parity-time-($\mathcal{PT}$-)symmetric non-Hermitian systems exhibit novel phenomena have attracted considerable attention. Here, we experimentally demonstrate QSD a $\mathcal{PT}$-symmetric system (i.e., QSD), by having states evolve under Hamiltonian lossy linear optical setup. We observe that two initially nonorthogonal can rapidly into...

Quantum metrology is superior to classical in parameter estimation. This because quantum states have coherence that, however, does not exist states. Previous works were limited the study of relationship between Fisher information (QFI) and initial probe state only for a specific single-qubit estimation process (e.g., described by spin angular momentum operator ${J}_{z}$). Here, we consider more general case QFI process, which ${J}_{\stackrel{P\vec}{n}}$ with unit vector...

Abstract We present a qubit-loss-free (QLF) fusion scheme for generating large-scale atom W states in cavity quantum electrodynamics (QED) system. Compared to the most current schemes which are conditioned on case where one particle can be extracted from each initial state process, our will access or two particles state. Based atom–cavity-field detuned interaction, three | 〉 n + m t generated , and with help of auxiliary atoms, q atoms. Comparing numerical simulations resource cost fusing...

Abstract Quantum metrology is an important field in quantum information and plays a crucial role parameter estimation. Fisher (QFI) widely used to characterize the precision of However, full understanding for different parameterization processes evolutions estimations, remains area research. In this paper, we introduce new concept, named as power (QFI power), QFI-creating capability evolutions. At same time, take both unitary non-unitary examples study QFI power. The results show that: (i)...

Abstract In this paper, we investigate the cluster Ising model (CIM) via steered quantum coherence (SQC) and entropic uncertainty relation (EUR). We present behavior of SQC quantified by L1 norm, relative entropy Jensen–Shannon divergence. also demonstrate properties EUR in CIM. addition, provide a comparative analysis these measures detailed numerical results.

Abstract High‐dimensional quantum systems offer many advantages over low‐dimensional systems. Meanwhile, unitary transformations on states are important parts in various information tasks, whereas they become technically infeasible as the dimensionality increases. The photonic orbital angular momentum (OAM), which is inherent transverse spatial mode of photons, offers a natural carrier to encode high‐dimensional spaces. However, it even more challenging realize arbitrary OAM states. Here, by...

A fundamental feature of micro objects is the wave-particle duality which addressed by Bohr’s complementarity principle. To observe wave and particle behaviours, quantum delayed-choice experiments based on linear optics have been realized at single-photon level. Since they were performed using a single photon as input, repeating measurements required in order to obtain different experimental data adjusting parameters was necessary prior each measurements. Different from previous works, we...