High-bandwidth squeezed light at 1550 nm from a compact monolithic PPKTP cavity

Ast, S.; Mehmet, M.; Schnabel, R.

doi:10.1364/oe.21.013572

Cited by 89 publications

(69 citation statements)

References 24 publications

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“…Consequently, the optomechanical interaction in units of the squeezed-cavity-mode photons can be enhanced, e.g., into the single-photon strongcoupling regime, by tuning the intensity (or frequency) of the driving field that induce the squeezing. In addition, we show that the noise of the squeezed cavity mode can be suppressed by introducing a broadbandsqueezed vacuum [42,43] with a reference phase matching the phase of the driving field. Under these conditions of enhanced coupling strength and suppressed noise, it should be feasible to implement single-photon quantum processes even in an originally weakly-coupled OMS.…”

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confidence: 94%

Squeezed Optomechanics with Phase-Matched Amplification and Dissipation

et al. 2015

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We investigate the nonlinear interaction between a squeezed cavity mode and a mechanical mode in an optomechanical system (OMS) that allows us to selectively obtain either a radiation-pressure coupling or a parametric-amplification process. The squeezing of the cavity mode can enhance the interaction strength into the single-photon strong-coupling regime, even when the OMS is originally in the weak-coupling regime. Moreover, the noise of the squeezed mode can be suppressed completely by introducing a broadband-squeezed vacuum environment that is phase-matched with the parametric amplification that squeezes the cavity mode. This proposal offers an alternative approach to control OMS using a squeezed cavity mode, which should allow single-photon quantum processes to be implemented with currently available optomechanical technology. Potential applications range from engineering single-photon sources to nonclassical phonon states. Cavity optomechanics has progressed enormously in recent years [1], with achievements including cooling of mechanical modes to their quantum ground states [2,3], demonstration of optomechanically-induced transparency [4,5], coherent state transfer between cavity and mechanical modes [6][7][8][9], and the realization of squeezed light [10][11][12]. In these experiments, a strong linearized optomechanical coupling is obtained under the condition of strong optical driving. However, the intrinsic nonlinearity of the radiation-pressure coupling in these OMSs is negligible [13][14][15][16][17][18][19].To explore the intrinsic nonlinearity of the optomechanical interaction, much theoretical research has recently focused on the single-photon strong-coupling regime, where the single-photon optomechanicalcoupling strength g 0 exceeds the cavity decay rate κ. In this regime, several interesting single-photon quantum processes are predicted, for both the optical and the mechanical modes. For example: photon blockade, the preparation of the nonclassical states of the optical and mechanical modes, multi-phonon sidebands, and quantum state reconstruction of the mechanical oscillator [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. However, these effects have not yet been realized experimentally due to the intrinsically weak radiation-pressure coupling in current OMSs, i.e., g 0 κ. To achieve g 0 ∼ κ, it has been proposed to use the collective mechanical modes in transmissive scatter arrays [35,36]. The ratio g 0 /κ may also be increased in superconducting circuits using the Josephson effect, but such devices are limited to electromechanical systems [37][38][39]. Moreover, postselected weak measurements [40] and optical coalescence [41] could also be used to increase the effective linear and quadratic optomechanical interactions, respectively.Here we present a method to reach the single-photon strong-coupling regime in an OMS, which is originally in the weak-coupling regime. In contrast to normal optomechanics, we focus on the nonlinear interaction between a parametric-amplification-squeezed ...

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confidence: 94%

Squeezed Optomechanics with Phase-Matched Amplification and Dissipation

et al. 2015

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“…Even with a monolithically integrated OPO, the bandwidth of the squeezing light is up to 2.5 GHz. 15 The use of a single-pass traveling-wave optical parametric amplifier (OPA) is an attractive way to obtain broadband squeezed light. Squeezing with THz bandwidth has been demonstrated thanks to the wide bandwidth of OPAs, which is, in principle, limited only by the transparency or phase matching conditions of the nonlinear medium itself.…”

Section: Introductionmentioning

confidence: 99%

Continuous-wave 6-dB-squeezed light with 2.5-THz-bandwidth from single-mode PPLN waveguide

et al. 2020

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Terahertz (THz)-bandwidth continuous-wave (CW) squeezed light is essential for integrating quantum processors with time-domain multiplexing (TDM) by using optical delay line interferometers. Here, we utilize a single-pass optical parametric amplifier (OPA) based on a single-spatial-mode periodically poled ZnO:LiNbO3 waveguide, which is directly bonded onto a LiTaO3 substrate. The single-pass OPA allows THz bandwidth, and the absence of higher-order spatial modes in the single-spatial-mode structure helps to avoid degradation of squeezing. In addition, the directly bonded ZnO-doped waveguide has durability for highpower pump and shows small photorefractive damage. Using this waveguide, we observe CW 6.3-dB squeezing at 20-MHz sideband by balanced homodyne detection. This is the first realization of CW squeezing with a single-pass OPA at a level exceeding 4.5 dB, which is required for the generation of a two-dimensional cluster state. Furthermore, the squeezed light shows 2.5-THz spectral bandwidth. The squeezed light will lead to the development of a high-speed on-chip quantum processor using TDM with a centimeter-order optical delay line.

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“…The configuration of the two-level atom can be realized in alkali-metal atoms, for example, cesium [36] and rubidium. [24] Squeezing of the cavity mode using PPKTP crystal is also demonstrated in ref. [24] Squeezing of the cavity mode using PPKTP crystal is also demonstrated in ref.…”

Section: Discussionmentioning

confidence: 84%

“…Notably, the nonlinearity of the medium is used to induce a squeezed cavity mode. [24,25] In the frame rotating at half the squeeze frequency ω p /2, the Hamiltonian of this system is given by ( =1) Experimentally, the proposed scheme could be implemented in the photonic crystal cavity, inspired by experimental advances in the coupled nanocavity arrays based on photonic crystals in present experiments.…”

Section: Modelmentioning

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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High-bandwidth squeezed light at 1550 nm from a compact monolithic PPKTP cavity

Cited by 89 publications

References 24 publications

Squeezed Optomechanics with Phase-Matched Amplification and Dissipation

Squeezed Optomechanics with Phase-Matched Amplification and Dissipation

Continuous-wave 6-dB-squeezed light with 2.5-THz-bandwidth from single-mode PPLN waveguide

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

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