Switching on and off of ultrastrong light-matter interaction: Photon statistics of quantum vacuum radiation

Garziano, Luigi; Ridolfo, A.; Stassi, Roberto; Stefano, Omar Di; Savasta, Salvatore

doi:10.1103/physreva.88.063829

Cited by 73 publications

(88 citation statements)

References 51 publications

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“…In cascaded atomic configurations Ξ [36,37], dark states results from interference effects between vacuum and ground state. These coherent superpositions of vacuum and multiphoton states are decoupled from higher energy levels by adiabatic Raman transitions and leads to the generation of virtual two photon excitations between atomic levels [40][41][42][43]. We use Λ structured atomic configuration together with the coupled cavity system and describe the operators η = α 1 +σ x and α 2 as the bright and dark polaritons interacting with coupling strength c 2 .…”

Section: B Input-output Theory and Effective Modelmentioning

confidence: 99%

“…Different from the generic models [36,37], spontaneous emergence of synchronization [27,52] in the presence of virtual photon conversion [40][41][42][43] makes our model advantageous in coupled cavity systems for switching and sending photons. When the single photon gate field is sent to the coupled cavity system, the incoming field is split into two fields incident both on the left and right cavities by time-reversed process of single-photon generation.…”

Section: B Photon Blockade and Input/output Theorymentioning

confidence: 99%

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On-chip photonic transistor based on the spike synchronization in circuit QED

Gül

2018

Int. J. Mod. Phys. B

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We consider the single photon transistor in coupled cavity system of resonators interacting with multilevel superconducting artificial atom simultaneously. Effective single mode transformation is used for the diagonalization of the hamiltonian and impedance matching in terms of the normal modes. Storage and transmission of the incident field are described by the interactions between the cavities controlling the atomic transitions of lowest lying states. Rabi splitting of vacuum induced multiphoton transitions is considered in input/output relations by the quadrature operators in the absence of the input field. Second order coherence functions are employed to investigate the photon blockade and delocalization-localization transitions of cavity fields. Spontaneous virtual photon conversion into real photons is investigated in localized and oscillating regimes. Reflection and transmission of cavity output fields are investigated in the presence of the multilevel transitions. Accumulation and firing of the reflected and transmitted fields are used to investigate the synchronization of the bunching spike train of transmitted field and population imbalance of cavity fields. In the presence of single photon gate field, gain enhancement is explained for transmitted regime.

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Section: B Input-output Theory and Effective Modelmentioning

confidence: 99%

Section: B Photon Blockade and Input/output Theorymentioning

confidence: 99%

On-chip photonic transistor based on the spike synchronization in circuit QED

Gül

2018

Int. J. Mod. Phys. B

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“…Optomechanics experiments are rapidly approaching the ultrastrong (or single-photon) coupling regime [6,[22][23][24], where the radiation pressure of a single photon displaces the mechanical resonator by more than its zero-point uncertainty [25]. This regime is attracting great interest also in cavity QED because it can give rise to novel quantum effects [26][27][28][29][30]. Realizing this ultrastrong coupling (USC) regime in optomechanical systems will facilitate the creation of quantum mechanical states of the mechanical resonator, as well as the characterization of such states by measuring the cavity photon field [23,25].…”

Section: Introductionmentioning

confidence: 99%

“…The framework here presented is an example of how the USC regime can favor the generation and control of mechanical quantum states. Moreover, the proposed strategy can be applied to other systems such as trapped ions [39] and and cavity QED into the USC regime [26,29,40,41],…”

Section: Introductionmentioning

confidence: 99%

Single-step arbitrary control of mechanical quantum states in ultrastrong optomechanics

et al. 2015

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We describe how ultrastrong interactions in optomechanical systems can be used to force the system ground state to evolve into an arbitrary quantum state of mechanical motion in a completely controlled and deterministic manner. If the target quantum state is a superposition of N Fock states, it can be obtained by applying in single-step N classical optical signals of different frequencies for a common time interval. This protocol can be applied to various strongly interacting quantum systems as trapped ions beyond the Lamb-Dicke regime and cavity QED into the ultrastrong coupling regime.

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“…However, the ground state can not emit energy, so the output photon flux can not be proportional to á ñ † a a , as in standard input-output theory. Instead, it has been shown [15,40] that the cavity output (which can be detected by a photo-absorber) is proportional to á ñ -+x demonstrates that the photons that contribute to the ground state are not observable physical particles. An analogous situation arises when the photons are coupled to collective matter excitations described by bosonic fields [41].…”

Section: Introductionmentioning

confidence: 99%

Feynman-diagrams approach to the quantum Rabi model for ultrastrong cavity QED: stimulated emission and reabsorption of virtual particles dressing a physical excitation

et al. 2017

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In quantum field theory, bare particles are dressed by a cloud of virtual particles to form physical particles. The virtual particles affect properties such as the mass and charge of the physical particles, and it is only these modified properties that can be measured in experiments, not the properties of the bare particles. The influence of virtual particles is prominent in the ultrastrong-coupling regime of cavity quantum electrodynamics (QED), which has recently been realised in several condensed-matter systems. In some of these systems, the effective interaction between atom-like transitions and the cavity photons can be switched on or off by external control pulses. This offers unprecedented possibilities for exploring quantum vacuum fluctuations and the relation between physical and bare particles. We consider a single three-level quantum system coupled to an optical resonator. Here we show that, by applying external electromagnetic pulses of suitable amplitude and frequency, each virtual photon dressing a physical excitation in cavity-QED systems can be converted into a physical observable photon, and back again. In this way, the hidden relationship between the bare and the physical excitations can be unravelled and becomes experimentally testable. The conversion between virtual and physical photons can be clearly pictured using Feynman diagrams with cut loops.

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Switching on and off of ultrastrong light-matter interaction: Photon statistics of quantum vacuum radiation

Cited by 73 publications

References 51 publications

On-chip photonic transistor based on the spike synchronization in circuit QED

On-chip photonic transistor based on the spike synchronization in circuit QED

Single-step arbitrary control of mechanical quantum states in ultrastrong optomechanics

Feynman-diagrams approach to the quantum Rabi model for ultrastrong cavity QED: stimulated emission and reabsorption of virtual particles dressing a physical excitation

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