107 citations · 544 across the 12 of their papers we have counts for
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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…
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…
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…
Perfect state transfer and efficient quantum routing: a discrete-time quantum walk approach
Xiang Zhan, Hao Qin, Zhi-hao Bian +2
We show a perfect state transfer of an arbitrary unknown two-qubit state can be achieved via a discrete-time quantum walk with various settings of coin flippings, and extend this m…
A one-dimensional quantum walk with multiple-rotation on the coin
Peng Xue, Rong Zhang, Hao Qin +3
We introduce and analyze a one-dimensional quantum walk with two time-independent rotations on the coin. We study the influence on the property of quantum walk due to the second ro…