Drastic increase of channel capacity in quantum secure direct communication using masking

Complete hyperentangled Bell states analysis for polarization-spatial-time-bin degrees of freedom with unity fidelity

“…Based on Equations (6)(7)(8)(9)(10)(11)(12)(13)(14), Equations (16)(17)(18)(19)(20)(21)(22)(23), and Equations (24-39), one can see that the spins of QD…”

“…Entanglement, a key quantum resource, plays a critical role in many important applications in quantum information processing (QIP), [1] including quantum key distribution, [2][3][4] quantum dense coding, [5][6][7] quantum teleportation, [8][9][10] quantum secret sharing, [11,12] quantum secure direct communication, [13][14][15][16][17] quantum networks, [18] and one-way quantum computation. [19,20] The entanglement of particle pairs simultaneously exists in more than one degree of freedom (DOF), [21][22][23][24][25][26][27] referred to as hyperentanglement, [2] and that is subject to high capacity, low loss rate, less quantum resources, and loss decoherence characters.…”

Complete Hyperentangled Bell States Analysis For Polarization‐Spatial‐Time‐Bin Degrees of Freedom with Unity Fidelity

“…Entanglement, a key quantum resource, plays a critical role in many important applications in quantum information processing (QIP), [1] including quantum key distribution, [2][3][4] quantum dense coding, [5][6][7] quantum teleportation, [8][9][10] quantum secret sharing, [11,12] quantum secure direct communication, [13][14][15][16][17] quantum networks, [18] and one-way quantum computation. [19,20] The entanglement of particle pairs simultaneously exists in more than one degree of freedom (DOF), [21][22][23][24][25][26][27] referred to as hyperentanglement, [2] and that is subject to high capacity, low loss rate, less quantum resources, and loss decoherence characters.…”

Collective unitary evolution with linear optics by Cartan decomposition

“…Linear optics provides an alternative physical platform for realizing varied quantum technologies, ranging from quantum computing [1][2][3], quantum communication [4][5][6][7][8][9][10][11][12][13][14] to quantum algorithms [15,16] and quantum metrology [17,18]. Photon is considered as an outstanding candidate for complex quantum information processing (QIP) because it naturally possesses various inherent qubit-like degrees of freedom (DOFs), long coherence time, robustness against the decoherence, and the availability of manipulation at single-photon level [2,19].…”