Enhancing Cavity Quantum Electrodynamics via Antisqueezing: Synthetic Ultrastrong Coupling

Leroux, Catherine; Govia, Luke C. G.; Clerk, Aashish A.

doi:10.1103/physrevlett.120.093602

Cited by 143 publications

(126 citation statements)

References 68 publications

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“…ing fundamental concepts in physics [1][2][3][4][5] but also in a plethora of applications such as polariton mediated energy transfer, 6,7 selective manipulation of excited states, 8 changing ground state reactivity of a molecule, 9 polariton lasing 10 etc. The strong coupling regime is attractive because in this regime the molecular energy landscape can be radically modified, the regime thus offers great opportunities to control molecular properties.…”

mentioning

confidence: 99%

Molecular Monolayer Strong Coupling in Dielectric Soft Microcavities

Vasista

Barnes

2020

Nano Lett.

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We report strong coupling of a monolayer of J -aggregated dye molecules to the whispering gallery modes of a dielectric microsphere at room temperature. We systematically studied the evolution of strong coupling as the number of layers of dye molecules was increased, we found the Rabi splitting to rise from 56 meV for a single layer to 94 meV for four layers of dye molecules. We compare our experimental results with 2D numerical simulations and a simple coupled oscillator model, finding good agreement.We anticipate that these results will act as a stepping stone for integrating moleculecavity strong coupling in a microfluidic environment since microspheres can be easily trapped and manipulated in such an environment, and provide open access cavities.

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mentioning

confidence: 99%

Molecular Monolayer Strong Coupling in Dielectric Soft Microcavities

Vasista

Barnes

2020

Nano Lett.

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“…[15][16][17][18] It is well known that in cavity QED system, the excitation of cavity field can be eliminated completely by confining and coupling two atoms to a single cavity. [15][16][17][18] It is well known that in cavity QED system, the excitation of cavity field can be eliminated completely by confining and coupling two atoms to a single cavity.…”

Section: Doi: 101002/andp201900220mentioning

confidence: 99%

Squeezing‐Enhanced Atom–Cavity Interaction in Coupled Cavities with High Dissipation Rates

Wang

Song

et al. 2019

Annalen der Physik

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The realization of the strong coupling regime is requisite for implementing quantum information tasks. Here, a method for enhancing the atom-field coupling in highly dissipative coupled cavities is proposed. By introducing parametric squeezing into the primary cavity, which is only virtually excited under specific parametric conditions, coupling enhancement between the atom and the auxiliary cavity is realized for appropriate squeezing parameters. This enables the system to be robust against large cavity decay and atomic spontaneous emission. The observation of vacuum Rabi oscillations show that the originally weakly coupled system can be enhanced into an effective strong coupling regime. IntroductionCavity quantum electrodynamics (QED) studies the light-matter interactions between cavity photons and quantum emitters, [1] such as Rydberg and neutral atoms, [2][3][4] superconducting qubits, [5,6] and semiconductor quantum dots (QDs). [7][8][9] Strong coupling regime, where atom-cavity coupling strength has to be comparable or larger than atomic spontaneous emission rate γ and cavity decay rate κ, [10,11] is indispensable for experimentally investigating a manifold of quantum phenomena and implementing quantum information processing (QIP). [12] Such strong interaction often requires resonators with high quality (Q) factor and small mode volume (V ) simultaneously, which is still difficult to engineer in experiments. However, flexible configurations for the cavities shift the mutual constraint between high Q and small V . It is demonstrated that by employing a coupled cavity configuration, [13] the requirement for high Q and small V for one cavity can be removed, [14] hence, effective strong coupling in highly dissipative cavity QED system is realized. On the other hand, considerable efforts have been devoted to enhance the atom-cavity coupling strength. Parametric squeezing of the

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“…More precisely, we can start with the trivial ground state of a weakly coupled circuit QED system, i.e., ground state ñ |g, 0 of equation (2) in the absence of the TDMFs with A j =0, and then adiabatically prepare the ground state of the ultrastrong or deep strong coupling AQRM by slowly ramping up the drive amplitudes A j =0. Once the desired state is achieved, the microwave drives can be turned off, returning the system to the weak-coupling dynamics for further measurements [18,21,65]. For this adiabatic preparation of the ground state, the considered evolution time is determined by p w »´T 20 2…”

Section: The Simulated Aqrm With Finite Large Frequency Ratiomentioning

confidence: 99%

“…Although exciting, natural implementations of the QRM in the USC/DSC regime in other platforms remain very challenging since they are confined by fundamental limitations. However, different schemes have been used to simulate the QRM in the USC/DSC regime using superconducting circuits [15][16][17][18], quantum optical systems [19], trapped ions [20,21], cold atoms [22], and so on.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we propose an experimentally feasible scheme to simulate the controllable AQRM demonstrating the USC and DSC dynamics with superconducting flux qubits. We show through analytical and numerical calculations that our schematic setup has the distinct advantage that the parameters in the effective AQRM can be individually controlled by the frequencies and the amplitudes of the bichromatic magnetic driving fields [17,18,38]. The all-round tunability of parameters in this model provides a powerful tool for exploring a few appealing issues.…”

Section: Introductionmentioning

confidence: 99%

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Quantum criticality and state engineering in the simulated anisotropic quantum Rabi model

et al. 2018

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Promising applications of the anisotropic quantum Rabi model (AQRM) in broad parameter ranges are explored, which is realized with superconducting flux qubits simultaneously driven by two-tone time-dependent magnetic fields. Regarding the quantum phase transitions (QPTs), with assistant of fidelity susceptibility, we extract the scaling functions and the critical exponents, with which the universal scaling of the cumulant ratio is captured with rescaling of the parameters due to the anisotropy. Moreover, a fixed point of the cumulant ratio is predicted at the critical point of the AQRM. In respect to quantum information tasks, the generation of the macroscopic Schrödinger cat states and quantum controlled phase gates are investigated in the degenerate case of the AQRM, whose performance is also investigated by numerical calculation with practical parameters. Therefore, our results pave a way to explore distinct features of the AQRM in circuit QED systems for QPTs, quantum simulations and quantum information processings.

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Enhancing Cavity Quantum Electrodynamics via Antisqueezing: Synthetic Ultrastrong Coupling

Cited by 143 publications

References 68 publications

Molecular Monolayer Strong Coupling in Dielectric Soft Microcavities

Molecular Monolayer Strong Coupling in Dielectric Soft Microcavities

Squeezing‐Enhanced Atom–Cavity Interaction in Coupled Cavities with High Dissipation Rates

Quantum criticality and state engineering in the simulated anisotropic quantum Rabi model

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