Quantum Process Nonclassicality

Rahimi-Keshari, Saleh; Kiesel, T.; Vogel, W.; Grandi, Samuele; Zavatta, Alessandro; Bellini, M.

doi:10.1103/physrevlett.110.160401

Cited by 40 publications

(60 citation statements)

References 29 publications

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“…The degree of quantumness of a state, and hence its resource for quantum processing, can in general be ascertained by its deviation from a coherent state [1]. In this context, a novel class of quantum states was implemented [2,3], where nonclassicality [4] is achieved by addition/subtraction of a single photon to/from a coherent state. Such nonclassical states with manipulated photon numbers have recently been utilized for a variety of tasks, from characterization of bosonic ladder operators [5] to noiseless coherent state amplification [6].…”

Section: Introductionmentioning

confidence: 99%

Charge and spin control of ultrafast electron and hole dynamics in single CdSe/ZnSe quantum dots

et al. 2018

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We study the dynamics of photoexcited electrons and holes in single negatively charged CdSe/ZnSe quantum dots with two-color femtosecond pump-probe spectroscopy. An initial characterization of the energy level structure is performed at low temperatures and magnetic fields of up to 5 T. Emission and absorption resonances are assigned to specific transitions between few-fermion states by a theoretical model based on a configuration interaction approach. To analyze the dynamics of individual charge carriers, we initialize the quantum system into excited trion states with defined energy and spin. Subsequently, the time-dependent occupation of the trion ground state is monitored by spectrally resolved differential transmission measurements. We observe subpicosecond dynamics for a hole excited to the D shell. The energy dependence of this D-to-S shell intraband transition is investigated in quantum dots of varying size. Excitation of an electron-hole pair in the respective p shells leads to the formation of singlet and triplet spin configurations. Relaxation of the p-shell singlet is observed to occur on a time scale of a few picoseconds. Pumping of p-shell triplet transitions opens up two pathways with distinctly different scattering times. These processes are shown to be governed by the mixing of singlet and triplet states due to exchange interactions enabling simultaneous electron and hole spin flips. To isolate the relaxation channels, we align the spin of the residual electron by a magnetic field and employ laser pulses of defined helicity. This step provides ultrafast preparation of a fully inverted trion ground state of the quantum dot with near unity probability, enabling deterministic addition of a single photon to the probe pulse. Therefore our experiments represent a significant step towards using single quantum emitters with well-controled inversion to manipulate the photon statistics of ultrafast light pulses.

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Section: Introductionmentioning

confidence: 99%

Charge and spin control of ultrafast electron and hole dynamics in single CdSe/ZnSe quantum dots

et al. 2018

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“…The photon addition is known to be a nonclassical process and, hence, can be used to generate nonclassical output states from classical inputs, cf., e.g., [39]. Now, let us study this operation for click counting devices.…”

Section: Multi-photon Additionmentioning

confidence: 99%

“…Recent developments led to a further enhancement of this kind of single-photon source [3][4][5][6][7][8][9]. Other protocols to manipulate quantum states in theory and experiment in the single photon regime are known as photon addition and photon subtraction [31][32][33][34][35][36][37][38][39]. These engineering protocols can be also used to add or subtract several photons [40,41] or to probe experimentally fundamental commutation relations [42].…”

Section: Introductionmentioning

confidence: 99%

Quantum state engineering by click counting

2014

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We derive an analytical description for quantum state preparation using systems of on-off detectors. Our method will apply the true click statistics of such detector systems. In particular, we consider heralded quantum state preparation using correlated light fields, photon addition, and photon subtraction processes. Using a post-selection procedure to a particular number of clicks of the detector system, the output states reveal a variety of quantum features. The rigorous description allows the identification and characterization of fundamentally unavoidable attenuations within given processes. We also generalize a known scenario of noiseless amplification with click detectors for the purpose of the preparation of various types of nonclassical states of light. Our exact results are useful for a choice of experimental parameters to realize a target state.

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“…Using this system, we can realize a quantum nonlinear absorption filter and the nonclassical quantum optical process defined by Rahimi-Keshari et al [22]. For the atoms interacting with coherent cavity fields with the initial state |G ⊗ | √ 2α c1 |0 c2 , the measurement of the atoms in the state |G at t = π/2 √ 2ξ will collapse the normal mode c 1 into a nonclassical quantum state finally by removing the component Fock state |2 from coherent c 1 mode.…”

Section: Quantum Nonclassical Process and Quantum Filtermentioning

confidence: 99%

“…Otherwise, the collective atomic states |G and |R will be shifted by different amount and the |G ↔ |R transition is thus out of resonance. This can be used for demonstration of the quantum nonclassical process [22], where a coherent state will be transformed to a nonclassical state. The coherent dynamics of the Rydberg atoms interacting with coherent cavity fields is shown in Fig.…”

Section: Quantum Nonclassical Process and Quantum Filtermentioning

confidence: 99%

Two-photon absorption and emission by Rydberg atoms in coupled cavities

Yang

Zheng

2013

Phys. Rev. A

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We study the dynamics of a system composed of two coupled cavities, each interacting with a single Rydberg atom. The interplay between Rydberg-Rydberg interaction and photon hopping enables the transition of the atoms from the collective ground state to the double Rydberg excitation state by individually interacting with the optical normal modes and suppressing the up conversion process between them. The atomic transition is accompanied by the two-photon absorption and emission of the normal modes. Since the energy level structure of the atom-cavity system is photon number dependent there is only a pair of states being in the two-photon resonance. Therefore, the system can act as a quantum nonlinear absorption filter through the nonclassical quantum process, converting coherent light field into a non-classical state. Meanwhile, the vacuum field in the cavity inspires the Rydberg atoms to simultaneously emit two photons into the normal mode, resulting in obvious emission enhancement of the mode.

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Quantum Process Nonclassicality

Cited by 40 publications

References 29 publications

Charge and spin control of ultrafast electron and hole dynamics in single CdSe/ZnSe quantum dots

Charge and spin control of ultrafast electron and hole dynamics in single CdSe/ZnSe quantum dots

Quantum state engineering by click counting

Two-photon absorption and emission by Rydberg atoms in coupled cavities

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