Success probability and performance optimization in non-Gaussian continuous-variable quantum teleportation

Continuous Variable Quantum Teleportation in a Dissipative Environment: Comparison of Non‐Gaussian Operations Before and After Noisy Channel

“…This is because the asymmetric cases (NG operations on only one mode) do not improve the fidelity as compared to the original state. [13,16] To realize these symmetric NG operations, we mix ancilla mode in Fock state |m 1 ⟩ (|m 2 ⟩) with mode A 1 (A 2 ) using a beam-splitter of transmissivity T. The output ancilla mode A ′ 1 (A ′ 2 ) is subjected to a conditional measurement of n 1 (n 2 ) photons. The simultaneous detection of n 1 and n 2 photons indicates the successful implementation of NG operations on both modes.…”

“…This is because the asymmetric cases (NG operations on only one mode) do not improve the fidelity as compared to the original state. [ 13,16 ] To realize these symmetric NG operations, we mix ancilla mode in Fock state $$|m_1\rangle$$ ($$|m_2\rangle$$) with mode $$A_1$$ ($$A_2$$) using a beam‐splitter of transmissivity $$T$$. The output ancilla mode $$A^{\prime }_1$$ ($$A^{\prime }_2$$) is subjected to a conditional measurement of $$n_1$$ ($$n_2$$) photons.…”

“…[6,7] With the current experimental techniques, it is not possible to obtain a highly squeezed state, [8] which puts an upper bound (less than one) on the teleportation fidelity. To overcome this limitation, one can resort to non-Gaussian (NG) operations, which have been shown to enhance the performance of not only quantum teleportation [9][10][11][12][13][14][15][16] but also various other protocols, such as quantum key distribution [17][18][19][20][21] and quantum metrology. [22][23][24][25][26][27][28][29] DOI: 10.1002/qute.…”

Enhanced Phase Estimation in Parity‐Detection‐Based Mach–Zehnder Interferometer using Non‐Gaussian Two‐Mode Squeezed Thermal Input State

“…[21] To overcome the hindrance caused by the upper limit on the maximum achievable squeezing, one can resort to the engineering of non-Gaussian states by performing photon subtraction (PS), photon addition (PA), or photon catalysis (PC) operations on the TMSV state. These non-Gaussian states have enhanced squeezing and entanglement, which has been utilized for performance improvement in quantum key distribution, [22][23][24][25][26][27] quantum teleportation [28][29][30][31][32][33] as well as quantum metrology. [34][35][36][37][38][39] Ideally, one would like to use states free from thermal noise.…”