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Open AccessSudden change of the photon output field marks phase transitions in the quantum Rabi model
The experimental observation of quantum phase transitions predicted by the quantum Rabi model in quantum critical systems is usually challenging due to the lack of signature experimental observables associated...
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Open AccessExperimental hierarchy of two-qubit quantum correlations without state tomography
A Werner state, which is the singlet Bell state affected by white noise, is a prototype example of states, which can reveal a hierarchy of quantum entanglement, steering, and Bell nonlocality by controlling th...
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Open AccessDynamically crossing diabolic points while encircling exceptional curves: A programmable symmetric-asymmetric multimode switch
Nontrivial spectral properties of non-Hermitian systems can lead to intriguing effects with no counterparts in Hermitian systems. For instance, in a two-mode photonic system, by dynamically winding around an e...
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Open AccessHybrid photon–phonon blockade
We describe a novel type of blockade in a hybrid mode generated by linear coupling of photonic and phononic modes. We refer to this effect as hybrid photon–phonon blockade and show how it can be generated and ...
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Article
Open AccessAtoms in separated resonators can jointly absorb a single photon
The coherent nonlinear process where a single photon simultaneously excites two or more two-level systems (qubits) in a single-mode resonator has recently been theoretically predicted. Here we explore the case...
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Open AccessChaotic synchronization of two optical cavity modes in optomechanical systems
The synchronization of the motion of microresonators has attracted considerable attention. In previous studies, the microresonators for synchronization were studied mostly in the linear regime. While the importan...
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Weak-force sensing with squeezed optomechanics
We investigate quantum-squeezing-enhanced weak-force sensing via a nonlinear optomechanical resonator containing a movable mechanical mirror and an optical parametric amplifier (OPA). Herein, we determined tha...
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Open AccessProposal to test quantum wave-particle superposition on massive mechanical resonators
We present and analyze a proposal for a macroscopic quantum delayed-choice experiment with massive mechanical resonators. In our approach, the electronic spin of a single nitrogen-vacancy impurity is employed ...
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Publisher Correction: Ultrastrong coupling between light and matter
The following changes have been made to the original article: in the lower-right panel of Fig. 1, opoelectrics has been corrected to optoelectronics; in the Box 1 footnote, rotating wave-approximation has been...
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Open AccessEnhancing entanglement detection of quantum optical frequency combs via stimulated emission
We investigate the performance of a certain nonclassicality identifier, expressed via integrated second-order intensity moments of optical fields, in revealing bipartite entanglement of quantum-optical frequen...
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Ultrastrong coupling between light and matter
Light–matter coupling with strength comparable to the bare transition frequencies of the system is called ultrastrong. This Review surveys how experiments have realized ultrastrong coupling in the past decade,...
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Open AccessSpatio-Temporal Steering for Testing Nonclassical Correlations in Quantum Networks
We introduce the concept of spatio-temporal steering (STS), which reduces, in special cases, to Einstein-Podolsky-Rosen steering and the recently-introduced temporal steering. We describe two measures of this ...
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Open AccessExperimental quantum forgery of quantum optical money
Unknown quantum information cannot be perfectly copied (cloned). This statement is the bedrock of quantum technologies and quantum cryptography, including the seminal scheme of Wiesner’s quantum money, which w...
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Open AccessExperimental temporal quantum steering
Temporal steering is a form of temporal correlation between the initial and final state of a quantum system. It is a temporal analogue of the famous Einstein-Podolsky-Rosen (spatial) steering. We demonstrate, ...
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Open AccessNonclassicality Invariant of General Two-Mode Gaussian States
We introduce a new quantity for describing nonclassicality of an arbitrary optical two-mode Gaussian state which remains invariant under any global photon-number preserving unitary transformation of the covari...
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Open AccessPriority Choice Experimental Two-Qubit Tomography: Measuring One by One All Elements of Density Matrices
In standard optical tomographic methods, the off-diagonal elements of a density matrix ρ are measured indirectly. Thus, the reconstruction of ρ, even if it is based on linear inversion, typically magnifies sma...
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Open AccessControllable microwave three-wave mixing via a single three-level superconducting quantum circuit
Three-wave mixing in second-order nonlinear optical processes cannot occur in atomic systems due to the electric-dipole selection rules. In contrast, we demonstrate that second-order nonlinear processes can oc...
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Sub-poissonian light in third-harmonic generation: Quantum predictions via classical trajectories
Sub-Poissonian light in the third-harmonic generation process is studied numerically and analytically. Special regime exhibiting the time-stable maximum sub-Poissonian behaviour with the Fano factorF ≈ 0.81 is fo...
