Method for generating a photonic NOON state with quantum dots in coupled nanocavities

Abstract

We propose a method to generate path-entangled N 00N -state photons from quantum dots (QDs) and coupled nanocavities. In the systems we considered, cavity mode frequencies are tuned close to the biexciton two-photon resonance. Under appropriate conditions, the system can have the target N 00N state in the energy eigenstate, as a consequence of destructive quantum interference. The N 00N state can be generated by the resonant laser excitation. This method, first introduced for two-photon N 00N state (N = 2), can be extended toward higher N 00N state (N > 2) based on our recipe, which is applied to the case of N = 4 as an example.

Unconventional photon blockade

“…(12) provided that c 10 = 0. 1 (0) versus its mean occupancy n1 under the optimal conditions (27,28) for several values of U (see legend). The inset shows the corresponding probability distribution compared to a Poissonian statistics for U = 10 −2 κ and n1 10 −3 .…”

“…In order to use the unconventional photon blockade for single photon applications, the system must be operated under pulsed excitation [47]. This requires either suppression of the g 1 (t1, t2) under the optimal conditions (27,28) for U = 4 × 10 −2 κ and f1 = 0.1κ. The contours display the two-time occupancy n1(t1, t2) = n(t1)n(t2) and the dashed line stands for the equal time g instance, by targeting the limiting case where τ c = π/J namely J = πκ results in U |opt 4 × 10 −2 κ which is still reasonably weak.…”

“…Contrary to what is commonly believed, small nonlinear energy shifts are actually a sufficient ingredient to build up sizable quantum correlations even under weak driving [22]. The key requirement is to couple at least two degrees of freedom in order to assist quantum interferences between excitation pathways [23][24][25][26][27]. In that framework, a strongly sub-Poissonian statistics can be achieved by means of a pair of driven dissipative resonators with an arbitrarily small single photon nonlinearity.…”

“…) oscillations or making them occur on a time scale longer than the cavity lifetime τ c = 1/κ. A value of ∆ = ∆ |opt = 0 is not allowed by Eqs (27,28). as it would require 2J 2 = κ 2 and therefore U |opt → ∞.…”

One-step engineering many-atom NOON state

“…(f is arbitrary phase and N=1, 2, 3...), which are widely applied in quantum lithography [3,4], quantum metrology [5,6], quantum imaging [7], and quantum information processing [8,9]. Many schemes have been proposed for generating photonic NOON states [10][11][12][13][14][15][16][17][18], however, most of them are based on the step-by-step strategy that means the time of generating NOON states will increase with increasing photon-number. On the other hand, atoms as important and excellent media, draw a great deal of attention [19][20][21][22] due to their various applications in quantum information and quantum metrology [23][24][25][26].…”