213 citations · 1.5k across the 27 of their papers we have counts for
27 papers
Continuous Time Quantum Walk Propagation for Irregular Temporal Graph Forecasting
Jiaqi Sun, Tianhao Li, Zhihao Bian
Continuous time quantum walks built on graph Laplacians produce non monotonic graph propagation features through quantum interference during evolution, which classical diffusion ca…
An experimental proposal certification for any three-qubit generalized Greenberger-Horne-Zeilinger states based on the fine-grained steering inequality
Zhi-Hao Bian, Jia-Qi Sun, Yi Shen
Multi-party quantum steering is an important concept in quantum information theory and quantum mechanics, typically related to quantum entanglement and quantum nonlocality. It enab…
The detection power of real entanglement witnesses under local unitary equivalence
Yi Shen, Lin Chen, Zhihao Bian
The imaginary unit has recently been experimentally proven to be indispensable for quantum mechanics. We study the differences in detection power between real and complex entan…
Quantum information dynamics in a high-dimensional parity-time-symmetric system
Zhihao Bian, Lei Xiao, Kunkun Wang +5
Non-Hermitian systems with parity-time () symmetry give rise to exceptional points (EPs) with exceptional properties that arise due to the coalescence of eigenvectors…
Experimental orthogonalization of highly overlapping quantum states with single photons
Gaoyan Zhu, Orsolya Kalman, Kunkun Wang +6
We experimentally realize a nonlinear quantum protocol on single-photon qubits with linear optical elements and appropriate measurements. The quantum nonlinearity is induced by pos…
Conserved quantities in parity-time symmetric systems
Zhihao Bian, Lei Xiao, Kunkun Wang +6
Conserved quantities such as energy or the electric charge of a closed system, or the Runge-Lenz vector in Kepler dynamics are determined by its global, local, or accidental symmet…
Observation of critical phenomena in parity-time-symmetric quantum dynamics
Lei Xiao, Kunkun Wang, Xiang Zhan +5
We experimentally simulate non-unitary quantum dynamics using a single-photon interferometric network and study the information flow between a parity-time (PT)-symmetric non-Hermit…
Higher winding number in a non-unitary photonic quantum walk
Lei Xiao, Xingze Qiu, Kunkun Wang +6
Topological matter exhibits exotic properties yet phases characterized by large topological invariants are difficult to implement, despite rapid experimental progress. A promising…
Observation of emergent momentum-time skyrmions in parity-time-symmetric non-unitary quench dynamics
Kunkun Wang, Xingze Qiu, Lei Xiao +5
Topology in quench dynamics gives rise to intriguing dynamic topological phenomena, which are intimately connected to the topology of static Hamiltonians yet challenging to probe e…
Simulating dynamic quantum phase transitions in photonic quantum walks
Kunkun Wang, Xingze Qiu, Lei Xiao +4
Signaled by non-analyticities in the time evolution of physical observables, dynamic quantum phase transitions (DQPTs) emerge in quench dynamics of topological systems and possess…
Violations of a Leggett-Garg inequality without signalling for a photonic qutrit probed with ambiguous measurements
Kunkun Wang, Clive Emary, Mengyan Xu +4
We realise a quantum three-level system with photons distributed among three different spatial and polarization modes. Ambiguous measurement of the state of the qutrit are realised…
Detecting topological invariants in nonunitary discrete-time quantum walks
Xiang Zhan, Lei Xiao, Zhihao Bian +5
We report the experimental detection of bulk topological invariants in nonunitary discrete-time quantum walks with single photons. The nonunitarity of the quantum dynamics is enfor…
Entanglement-enhanced quantum metrology in a noisy environment
Kunkun Wang, Xiaoping Wang, Xiang Zhan +4
Quantum metrology overcomes standard precision limits and plays a central role in science and technology. Practically it is vulnerable to imperfections such as decoherence. Here, w…
Optimal experimental demonstration of error-tolerant quantum witnesses
Kunkun Wang, George C. Knee, Xiang Zhan +3
Testing quantum theory on macroscopic scales is a longstanding challenge that might help to revolutionise physics. For example, laboratory tests (such as those anticipated in nanom…
Centrality measure based on continuous-time quantum walks and experimental realization
Josh A. Izaac, Xiang Zhan, Zhihao Bian +4
Network centrality has important implications well beyond its role in physical and information transport analysis; as such, various quantum walk-based algorithms have been proposed…
Enhanced violations of Leggett-Garg inequalities in an experimental three-level system
Kunkun Wang, Clive Emary, Xiang Zhan +3
Leggett-Garg inequalities are tests of macroscopic realism that can be violated by quantum mechanics. In this letter, we realise photonic Leggett-Garg tests on a three-level system…
Localized State in a Two-Dimensional Quantum Walk on a Disordered Lattice
Peng Xue, Rong Zhang, Zhihao Bian +3
We realize a pair of simultaneous ten-step one-dimensional quantum walks with two walkers sharing coins, which we prove is analogous to the ten-step two-dimensional quantum walk wi…
Experimental investigation of the stronger uncertainty relations for all incompatible observables
Kunkun Wang, Xiang Zhan, Zhihao Bian +3
The Heisenberg-Robertson uncertainty relation quantitatively expresses the impossibility of jointly sharp preparation of incompatible observables. However it does not capture the c…
Experimental quantum-walk revival with a time-dependent coin
Peng Xue, Rong Zhang, Hao Qin +4
We demonstrate a quantum walk with time-dependent coin bias. With this technique we realize an experimental single-photon one-dimensional quantum walk with a linearly-ramped time-d…
Experimental generalized contextuality with single-photon qubits
Xiang Zhan, Eric G. Cavalcanti, Jian Li +4
Contextuality is a phenomenon at the heart of the quantum mechanical departure from classical behaviour, and has been recently identified as a resource in quantum computation. Expe…
Realization of single-qubit positive operator-valued measurement via a one-dimensional photonic quantum walk
Zhihao Bian, Jian Li, Hao Qin +4
We perform generalized measurements of a qubit by realizing the qubit as a coin in a photonic quantum walk and subjecting the walker to projective measurements. Our experimental te…
Linear optical demonstration of quantum speed-up with a single qudit
Xiang Zhan, Jian Li, Hao Qin +2
Though quantum algorithm acts as an important role in quantum computation science, not only for providing a great vision for solving classically unsolvable problems, but also due t…
Experimental realization of a single qubit SIC POVM on via a one-dimensional photonic quantum walk
Zhihao Bian, Jian Li, Hao Qin +2
Symmetric informationally complete positive operator-valued measurement (SIC-POVM) is one important class of quantum measurement which is crucial for various quantum information pr…
Experimental realization of a generalized measuring device via a one-dimensional photonic quantum walk
Zhihao Bian, Rong Zhang, Hao Qin +3
We demonstrate an implementation of unambiguous state discrimination of two equally probable single-qubit states via a one-dimensional photonic quantum walk experimentally. Further…