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Quantum enhanced multiple phase estimation is essential for various applications in quantum sensors and imaging. For multiple phase estimation, the sensitivity enhancement is dependent on both quantum probe states and measurement. It is known that multi‐mode states can outperform other probe states for estimating multiple phases. However, it is generally not feasible in practice to implement...
We show that non-zero discord state can be generated via classical second-order interference. Considering the fundamental importance of interference, this result provides a new insight to understand the physical interpretation of quantum discord.
Decoherence on two-qubit systems degrades entanglement, and sometimes even causes entanglement sudden death (ESD). We show quantum measurement reversal on only one subsystem can avoid ESD, providing methods for practical entanglement distribution under decoherence.
Decoherence on two-qubit systems degrades entanglement, and sometimes even causes entanglement sudden death (ESD). We show that quantum measurement reversal on only one subsystem can avoid ESD, providing methods for practical entanglement distribution under decoherence.
We report that quantum discord can be protected from decoherence by making use of weak and reversing quantum measurements, making it possible to distribute quantum correlation between two remote parties in noisy environment.
Quantum states can exhibit exchange symmetry; local quantum operations on the subsystems are exchangeable without affecting the quantum state. Here, we report that the exchange symmetry is broken once decoherence is introduced, even though the photons still share non-zero entanglement.
We propose and experimentally implement the delayed-choice decoherence suppression protocol. Using photonic entanglement, we successfully demonstrated that the choice to suppress decoherence can be delayed after decoherence and even after the detection of a qubit.
We investigate the conditions of an optimal measurement for estimating quantum states with minimal disturbance and maximal reversibility, and experimentally implement it in three-dimensional quantum states encoded by the single photon's polarization and path.
We report the generation of a photon-number entangled state in which detection of ancillary photons heralds the generation of the entangled state as well as its phase. Our scheme can operate with separable input states.
We observed nonmonotonic dependence of a many-particle detection probability on the particles' mutual distinguishability. Such nonmonotonicity is a generic feature of the quantum-to-classical transition in multiparticle systems.
We report the first experimental implementation of an approximate partial transpose operation for photonic two-qubit systems. Direct detection of entanglement using the partial transpose operation is also demonstrated without performing quantum state tomography.
In this paper, we propose and analyze an experimental scheme for directly observing the noncommutativity of the position and the momentum operators using single-photon quantum interference.
We experimentally demonstrate the non-monotonic dependence of many-particle interference signals on the particles mutual distinguishability. Such non-monotonicity is a generic feature of the quantum to classical transition in multiparticle systems.
We report the first experimental realization of an approximate partial transpose for photonic two-qubit systems. Direct detection of entanglement, i.e., without performing quantum state tomography, using the partial transpose operation, is also demonstrated.
We investigate approximating the universal transpose of quantum states of two-level systems (qubits) using the method known as the structural physical approximation to positive maps. We also report its experimental implementation in linear optics.
We report experimental verification of the commutation relation for Pauli spin operators using the single-photon polarization state. The experimental quantum operation corresponding to the commutator, [σz,σx]=kσy, showed process fidelity of 0.94 compared to the ideal σy operation and |k| is determined to be 2.12±0.18.
In the Aharonov-Albert-Vaidman (AAV) weak measurement, it is assumed that the measuring device or the pointer is in a quantum mechanical pure state. In reality, however, it is often not the case. In this paper, we generalize the AAV weak measurement scheme to include more generalized situations in which the measuring device is in a mixed state. We also report an optical implementation of the weak...
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