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(Color online) Bloch sphere and energy level for nitrogen vacancy center in diamond. (a) The states need to be cloned are in a specified form which are located in the equator of the Bloch sphere . (b) Energy level of the NV center in diamond. (c) Two-dimension scanning confocal image of the sample. Bright spot circled is the NV center, we investigate.
(Color online) Second order photon correlation function, ESR spectrum, Rabi oscillations of two transitions. (a) Second order photon correlation function g 2(τ) of the NV center. (b) ESR spectrum of the NV center. Two main peaks correspond to ms = 1 and ms = −1. (c) Rabi oscillations for the transition between ms = 0 and ms = 1. (d) Rabi oscillations for the transition between ms = 0 and ms = −1.
(Color online) Scheme for quantum phase cloning. (a)A MW1 π/2 pulse creates state, then apply MW2 for another π/2 pulse for quantum phase cloning. After all, we measure the standard Rabi oscillations for transition between |ms = 0〉 p and |ms = −1〉 p . (b) The same pulse sequence for the phase cloning, but we measure the Rabi oscillations for transition between |ms = 0〉 p and |ms = 1〉 p . (c) A MW1 3π/2 pulse can create state, after phase cloning, we measure Rabi oscillations with MW1. (d) The MW1 3π/2 pulse create state, after cloning, we measure Rabi oscillations with MW2.
(Color online) Measured results of the quantum phase cloning. (a) Red line is the standard dependence of probability of the state |ms = 0〉 p on the phase of microwave pulse, by applying pulse sequence Figure 3(a), the black square is the experiment results for Rabi oscillations of transition with MW1, the start point of this curve determines the population probability at the state |ms = 0〉 p is 33%, theory is also around 33%. (b) Start point of the curve determines the probability at the state |ms = 0〉 p is 48% and theory is 50%. (c) and (d) The start points of the curves determine the probability at the state |ms = 0〉 p are 36% and 44% and theory are 33% and 50%.
(Color online) Quantum phase cloning for input state with different phases. (a) MW1 π/2 pulse is applied to create state, before applying MW2, we wait for time jdt, j = 1,2,…, dt = 20 ns, 50 ns so that state evolves freely to another state with additional relative phase ωjdt depending on waiting time jdt and rotating speed ω determined by environment, see Ref. 20. (b) Experiment results show that with different waiting time periods within time scale 2 μs, after phase cloning operation, the intensity of fluorescence of the output state is stable which agrees with theory expectation.
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