Intensified antibunching via feedback-induced quantum interference

Lu, Yao; Naumann, Nicolas L.; Cerrillo, Javier; Zhao, Qing; Knorr, Andreas; Carmele, Alexander

doi:10.1103/physreva.95.063840

Cited by 21 publications

(20 citation statements)

References 58 publications

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“…It is readily shown that the second and third terms are complex conjugates of one another so there are just two integrals to compute in a numerical implementation. From (18) and the similar result for the expectation of C † 1 C 1 , we now have:…”

Section: Calculating the Probability For A Quantum Jumpsupporting

confidence: 56%

Quantum trajectory theory of few-photon cavity-QED systems with a time-delayed coherent feedback

2020

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We describe an efficient approach to modelling cavity quantum electrodynamics (QED) with a time-delayed coherent feedback using quantum trajectory simulations. An analytical set of equations is derived to exploit the advantages of trajectories in the presence of the non-Markovian dynamics, where adjustments to the standard stochastic dynamics are discussed. In the weak excitation regime, we first verify that our approach recovers known results obtained with other simulation methods and demonstrate how a coherent feedback loop can increase the photon lifetime in typical cavity-QED systems. We then explore the nonlinear few-photon regime of cavity-QED, under the restriction of at most one photon at a time in the feedback loop. In particular, we show how feedback affects the cavity photoluminescence (populations versus laser detuning), and describe how one must account for conditioning in the presence of feedback, specifically the system observables must be conditioned on no photon detections at the feedback output channel occurring.

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Section: Calculating the Probability For A Quantum Jumpsupporting

confidence: 56%

Quantum trajectory theory of few-photon cavity-QED systems with a time-delayed coherent feedback

2020

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“…Another setup for coherent feedback control consists of two 2LS interacting via the respective coupling

g_{i}

with a single‐mode cavity . The cavity is pumped by a weak continuous‐wave pump field

Ω ≪ g_{i}

and placed inside a semi‐infinite photonic waveguide which provides non‐Markovian feedback at delay time τ.…”

Section: Conventional Coherent Feedback Control Schemesmentioning

confidence: 99%

“…While a (destructive) feedback phase of

ϕ = (2 n + 1) π

n \in N

, (dot‐dashed lines) leads to low intensity and the suppression of antibunching, a (constructive) feedback phase

ϕ = 2 π n

n \in N

Section: Conventional Coherent Feedback Control Schemesmentioning

confidence: 99%

Revisiting Quantum Feedback Control: Disentangling the Feedback‐Induced Phase from the Corresponding Amplitude

et al. 2019

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Coherent time‐delayed feedback allows the control of a quantum system and its partial stabilization against noise and decoherence. The crucial and externally accessible parameters in such control setups are the round‐trip‐induced delay time τ and the frequencies ω of the involved optical transitions which are typically controllable via global parameters like temperature, bias, or strain. They influence the dynamics via the amplitude and the phase ϕ=ωτ of the feedback signal. These quantities are, however, not independent. Here, the aim is to control the feedback phase via a microwave pump field. Using the example of a Λ‐type three‐level system, it is shown that the Rabi frequency of the pump field induces phase shifts on demand and therefore increases the applicability of coherent quantum feedback control protocols.

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“…(2) and increasing reservoir-system entanglement spread. Possible strategies have been proposed in the Heisenberg picture [23], in the quantum cascaded approach based on Liouvillian [12] or on the quantum stochastic Schrödinger equation [11,27].…”

Section: Phenomenological Modelmentioning

confidence: 99%

Unraveling mirror properties in time-delayed quantum feedback scenarios

Faulstich

Kraft

Carmele

2017

Journal of Modern Optics

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We derive in the Heisenberg picture a widely used phenomenological coupling element to treat feedback effects in quantum optical platforms. Our derivation is based on a microscopic Hamiltonian, which describes the mirror-emitter dynamics based on a dielectric, a mediating fully quantized electromagnetic field, and a single two-level system in front of the dielectric. The dielectric is modeled as a a system of identical two-state atoms. The Heisenberg equation yields a system of describing differential operator equations, which we solve in the Weisskopf-Wigner limit. Due to a finite round-trip time between emitter and dielectric, we yield delay differential operator equations.Our derivation motivates and justifies the typical phenomenological assumed coupling element and allows, furthermore, a generalization to a variety of mirrors, such as dissipative mirrors or mirrors with gain dynamics. * E-mail me at: faulstich@math.tu-berlin.de; Visit: http://page.math.tu-berlin.de/˜faulstich/ 1 arXiv:1703.05928v2 [quant-ph]

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Intensified antibunching via feedback-induced quantum interference

Cited by 21 publications

References 58 publications

Quantum trajectory theory of few-photon cavity-QED systems with a time-delayed coherent feedback

Quantum trajectory theory of few-photon cavity-QED systems with a time-delayed coherent feedback

Revisiting Quantum Feedback Control: Disentangling the Feedback‐Induced Phase from the Corresponding Amplitude

Unraveling mirror properties in time-delayed quantum feedback scenarios

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