Enhancing Optomechanical Coupling via the Josephson Effect

Heikkilä, Tero T.; Massel, Francesco; Tuorila, Jani; Khan, Raphaël; Sillanpää, Mika

doi:10.1103/physrevlett.112.203603

Cited by 134 publications

(132 citation statements)

References 47 publications

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“…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.…”

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confidence: 99%

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: 99%

Squeezed Optomechanics with Phase-Matched Amplification and Dissipation

et al. 2015

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“…Importantly, many interesting nonlinear effects might be demonstrated in this regime, such as macroscopic nonclassical states [23][24][25][26][27], the photon blockade phenomenon [28][29][30][31][32], and multiphonon sideband effects [33]. However, until now the nonlinear quantum regime of an OMS is still a challenging topic, while many theoretical schemes have been proposed to reach the nonlinear quantum regime with current experimental technologies, such as enhancing the radiationpressure coupling by employing the Josephson effects in superconducting circuits [34][35][36], the optical coalescence effects [37], and the squeezing effects of the cavity mode [38].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear effects in modulated quantum optomechanics

et al. 2017

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The nonlinear quantum regime is crucial for implementing interesting quantum effects, which have wide applications in modern quantum science. Here we propose an effective method to reach the nonlinear quantum regime in a modulated optomechanical system (OMS), which is originally in the weak-coupling regime. The mechanical spring constant and optomechanical interaction are modulated periodically. This leads to the result that the resonant optomechanical interaction can be effectively enhanced into the single-photon strong-coupling regime by the modulation-induced mechanical parametric amplification. Moreover, the amplified phonon noise can be suppressed completely by introducing a squeezed vacuum reservoir, which ultimately leads to the realization of photon blockade in a weakly coupled OMS. The reached nonlinear quantum regime also allows us to engineer the nonclassical states (e.g., Schrödinger cat states) of cavity field, which are robust against the phonon noise. This work offers an alternative approach to enhance the quantum nonlinearity of an OMS, which should expand the applications of cavity optomechanics in the quantum realm.

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“…As usual, these two modes are coupled via the generic radiation pressure coupling g 0 . In addition, here we consider an extra cross-Kerr type coupling g ck between the optical and the mechanical mode, generated by a two-level system or a superconducting charge qubit [41,42]. Also, the whole system is driven by an external laser of frequency ω l .…”

Section: Model and Equationsmentioning

confidence: 99%

“…In recent years, quantum discord has received much attention in optomechanical systems to study non-classical correlations in it [38]. In particular, it has been both Very recently, optomechanical systems coupled to a two-level system or a nonlinear inductive element (singleCooper pair transistor) have shown significant enhancement of the single-photon radiation-pressure coupling [41,42]. More importantly, it has been theoretically deduced that such interaction induces an additional crossKerr type coupling between the optical and mechanical mode.…”

Section: Introductionmentioning

confidence: 99%

Enhancing quantum correlations in an optomechanical system via cross-Kerr nonlinearity

Chakraborty

Sarma

2017

J. Opt. Soc. Am. B

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In this work, we theoretically study the quantum correlations present in an optomechanical system by invoking an additional cross-Kerr coupling between the optical and mechanical mode. Under experimentally achievable conditions, we first show that a significant enhancement of the steady-state entanglement could be achieved at a considerably lower driving power, which is also extremely robust with respect to system parameters and environmental temperature. Then, we employ Gaussian quantum discord as a witness of the genuine quantumness of the correlation present in the system and discuss its dependence on the cross-Kerr nonlinearity.

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Enhancing Optomechanical Coupling via the Josephson Effect

Cited by 134 publications

References 47 publications

Squeezed Optomechanics with Phase-Matched Amplification and Dissipation

Squeezed Optomechanics with Phase-Matched Amplification and Dissipation

Nonlinear effects in modulated quantum optomechanics

Enhancing quantum correlations in an optomechanical system via cross-Kerr nonlinearity

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