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Measurement of qubits
We describe in detail the theory underpinning the measurement of density matrices of a pair of quantum two-level systems ~‘‘qubits’’ !. Our particular emphasis is on qubits realized by the two
Observation of the Spin Hall Effect of Light via Weak Measurements
The spin-dependent displacement perpendicular to the refractive index gradient for photons passing through an air-glass interface is detected, indicating the universality of the effect for particles of different nature.
A strong loophole-free test of local realism
An loophole-free test of Bells inequalities and the probability that local realism is compatible with the results is less than 5.9×10<sup>-9</sup>.
Detection-loophole-free test of quantum nonlocality, and applications.
A source of entangled photons is presented that violates a Bell inequality free of the "fair-sampling" assumption, and is used to generate "device-independent" private quantum random numbers at rates over 4 orders of magnitude beyond previous experiments.
Generation of hyperentangled photon pairs.
It is experimentally demonstrate the first quantum system entangled in every degree of freedom (hyperentangled) and reports the tomography of a 2 x 2 x 3 x 3 system (36-dimensional Hilbert space), which is believed to be the first reported photonic entangled system of this size to be so characterized.
Ultra-bright source of polarization-entangled photons
Utilizing the process of spontaneous parametric down-conversion in a novel crystal geometry, a source of polarization-entangled photon pairs has been provided that is more than ten times brighter,
Practical free-space quantum key distribution over 1 km
A working free-space quantum key distribution system has been developed and tested over an outdoor optical path of {approximately}1 km at Los Alamos National Laboratory under nighttime conditions.
High-efficiency Quantum Interrogation Measurements via the Quantum Zeno Effect
The phenomenon of quantum interrogation allows one to optically detect the presence of an absorbing object, without the measuring light interacting with it. In an application of the quantum Zeno
A do-it-yourself quantum eraser.