Photonic scheme of quantum phase estimation for quantum algorithms via quantum dots

Photonic schemes of distribution and reconstruction of an entangled state from hybrid entanglement between polarization and time-bin via quantum dot

“…Furthermore, for a practical PRET gate (i.e., a nonlinear optical device) via the QD-cavity system, we quantified the effects of vacuum noise and leaky modes (i.e., sideband leakage and absorption) in the QD-cavity system [9, 10, 16, 21, 34-36, 52, 56-58]. In addition, we demonstrated the experimental conditions for achieving reliable performance of the QD-cavity system based on the analyses [9, 10, 16, 21, 34-36, 52, 56-58] through quantum Langevin equations and input-output relations from the Jaynes-Cummings Hamiltonian H JC [9,10,16,[34][35][36][56][57][58][59] under vacuum noise and leaky modes.…”

“…Entanglement is a critical component in quantum information processing applications, such as quantum communications [1][2][3][4][5], and quantum algorithms [6][7][8][9][10]. In addition, many studies on the unique nature of entanglement have been conducted for the generation [11][12][13], measurement [14][15][16], purification, and concentration [12,[17][18][19][20].…”

“…From this point view, quantum dot (QD) is widely utilized in physical (quantum optical) resource. The QDs confined in a single-sided optical cavity (QD-cavity system) [9,10,16,21,[28][29][30][31][32][33][34][35][36] can implement quantum controlled operations to isolate quantum information from the environment to achieve a long electron-spin coherence time (T s 2 e ~m ) [37][38][39][40][41][42] and spin relaxation period (T ms 1 e ~) [29,[43][44][45]. Therefore, many researchers have designed quantum controlled gates [9, 10, 16, 32-34, 36, 46-50] to utilize QD-cavity systems for various quantum information processing schemes.…”

“…2. Interaction of photons and QD, and the two-photon polarization entangler gate using a QD-cavity system Figure 1(A) shows the QD-cavity system [9,10,16,21,[28][29][30][31][32][33][34][35][36] in which a self-assembled QD charged with a single electron is embedded in the center of a single-sided cavity consisting of two GaAs/Al(Ga)As distributed Bragg reflectors (DBRs). The top and bottom DBRs are 100% reflective and partially reflective, respectively.…”

“…Note that w C -and c w are the frequencies of Cand the cavity mode, respectively. Under the experimental conditions g 2.4, 10,16,21,[34][35][36][61][62][63], the values of the reflectances and phase shifts can be obtained as R R 1,…”