Two-photon absorption by spectrally shaped entangled photons

Oka, Hisaki

doi:10.1103/physreva.97.033814

Cited by 37 publications

(23 citation statements)

References 22 publications

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“…Similarly to the result for a simple three-level system in Ref. [21], large enhancement can be achieved; ζ exhibits a linear dependence with σ and reaches 2500 at σ = 100 THz for the present parameters. The symbol • denotes ζ for the total population of the vibrational modes in the excited states.…”

Section: Resultssupporting

confidence: 85%

“…This is because the inherent coincidence of the entangled photons is perfectly suited to TPA and the coincidence of photons is seemingly unsuitable for TSE because in TSE each of the two photons is sequentially absorbed. However, in our previous work [21], we have shown that the entangled photons can enhance the efficiency of not only the TPA but also the TSE. Although the analysis is restricted to a simple three-level system, the population of an excited state is enhanced a thousand times as large as that by uncorrelated photons.…”

Section: Introductionmentioning

confidence: 84%

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Enhanced vibrational-mode-selective two-step excitation using ultrabroadband frequency-entangled photons

Oka

2018

Phys. Rev. A

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We theoretically investigate strongly-enhanced vibrational-mode-selective two-step excitation by ultrabroadband frequency-entangled photons. A diatomic molecule having three sets of vibronic states is used to evaluate the excitation efficiency of the two-step excitation. We show that the photon entanglement has little influence on the populations of intermediate vibrational modes of intermediate states but selectively increases the population of a single vibrational mode of excited states, resonant with the total energy of the entangled photons. For an ultrashort pulse close to a monocycle with high degree of entanglement, the population of the vibrational mode is enhanced 2500 times as large as that by uncorrelated photons and the selectivity nearly reaches unity. Our results indicate that the two-step excitation with ultrabroadband frequency-entangled photons can achieve highly-selective and strongly-enhanced excitation of a single vibrational mode.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 84%

Enhanced vibrational-mode-selective two-step excitation using ultrabroadband frequency-entangled photons

Oka

2018

Phys. Rev. A

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“…In this case [36], the shaping of entangled photonic wave functions [37][38][39] can enhance the absorption probability. This strategy was explored in a number of recent theoretical papers, where the crucial role of quantum correlations between different travelling modes [40][41][42], or of the quantum statistics of a cavity mode [43], was highlighted. In contrast to classical control described by optimal control theory, the light fields have to be treated quantum mechanically, and, due to the small photon number per mode, perturbation theory can be employed.…”

Section: Introductionmentioning

confidence: 99%

How to optimize the absorption of two entangled photons

2021

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We investigate how entanglement can enhance two-photon absorption in a three-level system. First, we employ the Schmidt decomposition to determine the entanglement properties of the optimal two-photon state to drive such a transition, and the maximum enhancement which can be achieved in comparison to the optimal classical pulse. We then adapt the optimization problem to realistic experimental constraints, where photon pairs from a down-conversion source are manipulated by local operations such as spatial light modulators. We derive optimal pulse shaping functions to enhance the absorption efficiency, and compare the maximal enhancement achievable by entanglement to the yield of optimally shaped, separable pulses.

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“…Notably, entangled photons can break classical noise limits [15][16][17][18][19] and are predicted to break Fourier reciprocal spectral and temporal precisions. [20][21][22][23] For example, a 500 nm bandwidth of entangled biphoton pairs compressed to a few femtoseconds is predicted to only interact at the wavelength and linewidth specified by the input pump laser, usually <1 MHz for a modern Ti:Sapphire oscillator. A narrow excited state distribution with a high temporal resolution can therefore be created, potentially allowing new forms of quantum control 21 .…”

Section: Introductionmentioning

confidence: 99%