Bidirectional highly-efficient quantum routing in a T-bulge-shaped waveguide*

Abstract

Quantum routing in a T-bulge-shaped waveguide system coupled with a driven cyclic three-level atom and a two-level atom is investigated theoretically. By employing the discrete-coordinate scattering method, exact expressions of the transport coefficients along three ports of the waveguide channels are derived. Our results show that bidirectional high transfer-rate single-photon routing between two channels can be effectively implemented, with the help of the effective potential generated by two atoms and the external driving. Moreover, multiple band zero-transmission emerges in the scattering spectra, arising from the quantum interferences among photons scattered by the boundary and the bulged resonators. The proposed system may suggest an efficient duplex router with filtering functions.

Quantum information processing in cavities: A review

“…Extending the ideas of controlling the reflection and transmission of a photon by an atom in an array, quantum routers [357][358][359][360][361][362][363][364][365][366][367][368][369][370] are proposed by coupling two different cavity arrays in X-shape [371], T -shape [372][373][374], T -bulge-shape [375,376], Π-shape [377], etc. Routing of photons allows to connect several quantum nodes to build a quantum network.…”

“…But, the opposite direction transfer remains to be less than 0.5. There are other type quantum routers such as multi-T -shape [362,378], Π-shape [377], T -bulge-shape [375,376], six-port quantum router [379], asymmetrically coupled-cavities fourport quantum router [380] etc. are proposed for increasing the transfer rate to both sides.…”

Single-photon scattering and quantum entanglement of two giant atoms with azimuthal angle differences in a waveguide system

“…[1][2][3] In the past decades, waveguide quantum electrodynamics (wQED) systems, [4] which can tailor effectively the coupling between one-dimensional waveguide modes and quantum emitters, have provided powerful platforms to investigate the photon scattering. Based on such ideal platforms, a wide variety of striking transport properties in one-dimensional waveguides have been demonstrated, including asymmetrical Fano-line shapes, [5][6][7][8] electromagnetically induced transparency without control light field, [9][10][11] waveguide-mediated quantum entanglement, [12][13][14][15] unconventional photon blockade, [16][17][18][19] high-efficiency quantum routing and frequency conversion, [20][21][22][23][24][25] generating photonic band structures and bound states, [26][27][28] etc.…”

Frequency-tunable single-photon router based on a microresonator containing a driven three-level emitter

“…[1] In optical quantum routing systems, one-dimensional optical waveguides are used as quantum channels, and photons are transmitted as carriers in different channels through waveguide quantum electrodynamics (wQED), [2] which can effectively control the transmission of photons by tailoring the couplings between photon fields and quantum emitters. Consequently, a wide variety of studies on quantum routing are implemented in various wQED systems, including atomic qubits, [3][4][5][6][7] superconducting qubits, [8][9][10][11][12] quantum dots, [13,14] optomechanical systems, [15,16] optical cavity systems, [17][18][19][20] and chiral waveguide systems. [21][22][23][24][25] Generally, for an optical transmission system the incident frequency should match the resonance frequency of the coupled emitter in the router, which enables the router work efficiently.…”