Measurement of the quantum superposition state of an imaging ensemble of photons prepared in orbital angular momentum states using a phase-diversity method

Due to the infinite range of possibly achievable degrees of freedom, orbital angular momentum (OAM) can tremendously increase the capacity of communication system. Here, we propose a scheme to generate OAM entanglement by using interaction-free measurement (IFM). As the superposition state of the quantum absorption object is not changed after IFM, our scheme can be extended to multiparty easily. The numerical analysis results show that the fidelity of generated OAM entanglement can be arbitrarily close to unity. Besides, the implementation issues are also discussed to evaluate the feasibility in experiment. This OAM entanglement with multiple degrees of freedom will play a key role in distributed entanglement computing and efficient quantum communication.

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Study on the superposition state for the generation of orbital-angular-momentum-carrying beam

2016 Progress in Electromagnetic Research Symposium (PIERS) ◽

10.1109/piers.2016.7734632 ◽

2016 ◽

Author(s):

Hongyan Liu ◽

Yongqiang Cheng ◽

Yu-Liang Qin ◽

Kang Liu ◽

Tiezhu Yuan

Keyword(s):

Angular Momentum ◽

Orbital Angular Momentum ◽

Superposition State

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All-silicon metasurfaces for polarization multiplexed generation of terahertz photonic orbital angular momentum superposition states

Journal of Materials Chemistry C ◽

10.1039/d1tc00594d ◽

2021 ◽

Vol 9 (16) ◽

pp. 5478-5485

Author(s):

Jie Li ◽

Guocui Wang ◽

Chenglong Zheng ◽

Jitao Li ◽

Yue Yang ◽

...

Keyword(s):

Angular Momentum ◽

Orbital Angular Momentum ◽

Degrees Of Freedom ◽

Engineering Application ◽

Superposition State ◽

Superposition States

The superposition state of photonic orbital angular momentum (OAM) has more degrees of freedom than pure photonic orbital angular momentum, with rich physical implications and engineering application possibilities.

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Generating arbitrary cebits on the orbital angular momentum Poincaré sphere

International Journal of Quantum Information ◽

10.1142/s0219749916400323 ◽

2016 ◽

Vol 14 (06) ◽

pp. 1640032

Author(s):

P. Chithrabhanu ◽

A. Aadhi ◽

Salla Gangi Reddy ◽

Shashi Prabhakar ◽

R. P. Singh

Keyword(s):

Angular Momentum ◽

Orbital Angular Momentum ◽

Rotation Angle ◽

Laser Beams ◽

Superposition State ◽

Sagnac Interferometer ◽

Poincaré Sphere ◽

General Complex ◽

Poincare Sphere

Using classical laser beams, we generate a general complex superposition state, cebit, of orbital angular momentum (OAM) of light. We use a nonseparable beam of polarization and OAM generated by a modified Sagnac interferometer for the generation of OAM cebits which can be represented as points on the OAM Poincaré sphere. The general cebit state is represented as a function of the rotation angle of the wave plates so that one can easily generate the required state.

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