Parametric Amplification of the Mechanical Vibrations of a Suspended Nanowire by Magnetic Coupling to a Bose-Einstein Condensate

Darázs, Zoltán; Kurucz, Z.; Kálmán, Orsolya; Kiss, T.; Fortágh, József; Domokos, P.

doi:10.1103/physrevlett.112.133603

Cited by 12 publications

(11 citation statements)

References 32 publications

(45 reference statements)

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“…Engineering a quantum mechanical system, for which the interaction between light and the motional degrees of freedom of a mechanical oscillator can be extensively controlled, is the objective of the fast developing research field of cavity optomechanics [1][2][3]. Various types of cavity optomechanical devices have been developed to take advantage of this interaction for applications in precision measurement of mechanical motion [4,5], exploration of macroscopic objects in the quantum regime [6], and fundamental platform research of hybrid quantum systems [7,8]. Recently, rapid advancements in fabrication methods for various mechanical elements have led to the development of high quality factor micro-and nanoscaled devices for a broad range of parameters [1,2].…”

Section: Introductionmentioning

confidence: 99%

Quantum reservoir engineering through quadratic optomechanical interaction in the reversed dissipation regime

Lee

Seok

2018

Phys. Rev. A

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We explore the electromagnetic field coupled to a mechanical resonator via quadratic optomechanical interaction in the reversed dissipation regime where the mechanical damping rate is much larger than the cavity field dissipation rate. It is shown that in this regime, the cavity field effectively acquires an additional reservoir which is conditioned by the temperature of the mechanical bath as well as the mechanical damping rate. We analytically find the steady-state mean photon number and the critical temperature of the mechanical oscillator to cool or heat the coupled electromagnetic field. We also show that in the case of quadratic coupling, the temperature of the mechanical oscillator can be estimated in the quantum regime by observing the noise spectrum of the cavity field.

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Section: Introductionmentioning

confidence: 99%

Quantum reservoir engineering through quadratic optomechanical interaction in the reversed dissipation regime

Lee

Seok

2018

Phys. Rev. A

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“…In quantum information science, nitrogen-vacancy (NV) centers in diamond are outstanding solid state qubits due to their long coherence times and high controllability [1][2][3][4][5]. In nano-mechanics, mechanical resonators made out of allotropes of carbon (such as nanotubes [6][7][8], diamond [9][10][11], and graphene [12]), are being extensively studied for fundamental research and practical applications [13][14][15][16][17][18][19][20][21][22][23].Recently, much attention has been paid to coupling NV spins in diamond to mechanical resonators, which can be achieved extrinsically [24][25][26][27][28][29][30][31][32][33][34] or intrinsically [35][36][37][38][39]. In the first case, the interaction arises from the relative motion of the NV spin and a source of local magnetic field gradients [24].…”

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confidence: 99%

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Hybrid Quantum Device with Nitrogen-Vacancy Centers in Diamond Coupled to Carbon Nanotubes

et al. 2016

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We show that NV centers in diamond interfaced with a suspended carbon nanotube carrying a dc current can facilitate a spin-nanomechanical hybrid device. We demonstrate that strong magnetomechanical interactions between a single NV spin and the vibrational mode of the suspended nanotube can be engineered and dynamically tuned by external control over the system parameters. This spin-nanomechanical setup with strong, intrinsic and tunable magnetomechanical couplings allows for the construction of hybrid quantum devices with NV centers and carbon-based nanostructures, as well as phonon-mediated quantum information processing with spin qubits.Carbon-based structures and devices are very commonly used in our everyday life and in state-of-the-art science and technology. In quantum information science, nitrogen-vacancy (NV) centers in diamond are outstanding solid state qubits due to their long coherence times and high controllability [1][2][3][4][5]. In nano-mechanics, mechanical resonators made out of allotropes of carbon (such as nanotubes [6][7][8], diamond [9][10][11], and graphene [12]), are being extensively studied for fundamental research and practical applications [13][14][15][16][17][18][19][20][21][22][23].Recently, much attention has been paid to coupling NV spins in diamond to mechanical resonators, which can be achieved extrinsically [24][25][26][27][28][29][30][31][32][33][34] or intrinsically [35][36][37][38][39]. In the first case, the interaction arises from the relative motion of the NV spin and a source of local magnetic field gradients [24]. In such setups, a magnetic tip mounted on a vibrating cantilever [40] is often used to generate the magnetic coupling between an NV spin and the mechanical motion [24][25][26][27][28][29][30][31][32][33][34]. However, creating very strong, well-controlled, local gradients remains challenging for such setups, in particular when arrays of NV centers are placed in close proximity to the same cantilever. Thus far, experiments with the extrinsic coupling scheme have yet to reach the strong-coupling regime [26][27][28][29]. In the second case, the coupling of a diamond cantilever to the spin of an embedded NV center is induced by crystal strain during mechanical motion [35][36][37][38][39]. Unfortunately, the strain-induced interaction between a single NV spin and the cantilever quantized motion is inherently tiny [37,38], which makes the strong strain coupling at a single quantum level very challenging.In this Letter, we propose that NV centers in diamond interfaced with carbon nanotubes can facilitate a spin-nanomechanical hybrid device. This hybrid structure takes advantage of the unprecedented mechanical and electrical characteristics of carbon nanotubes, as well as the exceptional coherence properties of NV centers in diamond. We demonstrate that the physics of an NV center in diamond placed near a carbon nanotube with a dc current flowing through it can be well mapped to cavity quantum-electrodynamics (QED). In particular, going beyond earlier work in this fie...

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“…Furthermore, temporal "Landau-Zener" sweeps of an external magnetic field [14,15] can be used to flip atomic spins while changing the phonon occupation in coupled systems. Unlike previously implemented cantilever designs that have been used to couple to ultracold atoms, we consider here SiN nanostring resonators [16][17][18][19] fabricated with high-tensile stress. For these devices, the mechanical behaviour is dominated by the stress in the string [20] and not the material properties, ultimately leading to high quality factors Q for the resonators, even at room-temperature.…”

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confidence: 99%

Magnetic-field-mediated coupling and control in hybrid atomic-nanomechanical systems

Tretiakov

LeBlanc

2016

Phys. Rev. A

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Magnetically coupled hybrid quantum systems enable robust quantum state control through Landau-Zener transitions. Here, we show that an ultracold atomic sample magnetically coupled to a nanomechanical resonator can be used to cool the resonator's mechanical motion, to measure the mechanical temperature, and to enable entanglement of more than one of these mesoscopic objects. We calculate the expected coupling for both permanent-magnet and current-conducting nanostring resonators and describe how this hybridization is attainable using recently developed fabrication techniques, including SiN nanostrings and atom chips.Hybrid quantum systems serve to bring the advantages of multiple quantum technologies together [1,2]. Currently, no individual platform is ideal -all systems have advantages for performing some tasks, while retaining less-desirable properties in other realms. Whether it is coherence time, facility for exchanging quantum information, or data processing speeds, the reason for an advantage is usually fundamentally tied to a difficulty. For ultracold atoms, isolation from the environment enables excellent coherence and state control, but hinders information transmission to conventional read-out technologies. Combining platforms to exploit the advantages and make irrelevant the disadvantages can lead the way to viable hybrid quantum technologies.Along with ultracold atoms, nanomechanical solidstate devices are among the leading candidates as components of hybrid systems [3][4][5]; unlike quantum gases, they have good readout but poor coherence times. Quantum correlations can be transferred between these very different platforms using electric and magnetic field couplings. Ultracold atoms and solid state device hybridization was demonstrated in a variety of systems: with optical fields to cavity modes [6,7] or vibrating membranes [8][9][10], and with magnetic fields via nanomechanical magnetic resonators [11][12][13]. As we will explain in detail, coherent coupling between the atomic and mechanical systems can be used to cool the mechanical motion of the resonators, to measure the mechanical system's temperature, and to transfer correlations between mechanical devices to realize entanglement.Here, we focus on systems where oscillating magnetic fields are used to drive transitions between long-lived ground states. While these transitions are inherently weaker than those from optical fields, the states' lifetimes are appealing for coherent quantum state control and reversible transfer of quantum coherence between systems. Furthermore, temporal "Landau-Zener" sweeps of an external magnetic field [14,15] can be used to flip atomic spins while changing the phonon occupation in coupled systems. Unlike previously implemented cantilever designs that have been used to couple to ultracold atoms, we consider here SiN nanostring resonators [16][17][18][19] fabricated with high-tensile stress. For these devices, the mechanical behaviour is dominated by the stress in the string [20] and not the material properties, ulti...

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Parametric Amplification of the Mechanical Vibrations of a Suspended Nanowire by Magnetic Coupling to a Bose-Einstein Condensate

Cited by 12 publications

References 32 publications

Quantum reservoir engineering through quadratic optomechanical interaction in the reversed dissipation regime

Quantum reservoir engineering through quadratic optomechanical interaction in the reversed dissipation regime

Hybrid Quantum Device with Nitrogen-Vacancy Centers in Diamond Coupled to Carbon Nanotubes

Magnetic-field-mediated coupling and control in hybrid atomic-nanomechanical systems

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