Quantum-state transfer between fields and atoms in electromagnetically induced transparency

Dantan, Aurélien; Pinard, M.

doi:10.1103/physreva.69.043810

Cited by 107 publications

(141 citation statements)

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“…Entanglement between mechanical degrees of freedom is achieved if the input fields are squeezed and if this squeezing is efficiently transferred to the movable mirrors. We show that a stationary entangled state can be generated with state-of-the-art apparata at cryogenic temperatures, and that it can be detected with a non-stationary homodyne measurement of the output light [9,10]. …”

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confidence: 99%

“…-The motion of a movable mirror is usually measured by monitoring the phase of the field reflected by a high-finesse resonant cavity [7,17]. In this paper, we adopt another strategy to readout the quantum noise of the mirrors, inspired by optical readout of atomic ensemble quantum states [9,10]. Let us assume that after completion of the fluctuation transfer between the fields and the mirrors, one rapidly switches off the squeezings entering the cavities, the field intensities being kept constant.…”

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confidence: 99%

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Entangling movable mirrors in a double-cavity system

Pinard¹,

Dantan²,

Vitali³

et al. 2005

Europhys. Lett.

208

195

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PACS. 42.50.Lc -Quantum fluctuations, quantum noise, and quantum jumps. PACS. 03.67.Mn -Entanglement production, characterization and manipulation. PACS. 05.40.Jc -Brownian motion.Abstract. -We propose a double-cavity set-up capable of generating a stationary entangled state of two movable mirrors at cryogenic temperatures. The scheme is based on the optimal transfer of squeezing of input optical fields to mechanical vibrational modes of the mirrors, realized by the radiation pressure of the intracavity light. We show that the presence of macroscopic entanglement can be demonstrated by an appropriate read out of the output light of the two cavities.Introduction. -Quantum entanglement is a physical phenomenon in which the quantum states of two or more systems can only be described with reference to each other. This leads to correlations between observables of the systems that cannot be understood on the basis of local realistic theories [1,2]. Its importance today exceeds the realm of the foundations of quantum physics and entanglement has become an important physical resource that allows performing communication and computation tasks with an efficiency which is not achievable classically [3]. In particular, it is important to investigate under which conditions entanglement between macroscopic objects, each containing a large number of the constituents, can arise. Entanglement between two atomic ensembles has been successfully demonstrated in Ref. [4] by sending pulses of coherent light through two atomic vapor cells. Then, other proposals suggested to entangle a nano-mechanical oscillator with a Cooper-pair box [5], arrays of nanomechanical oscillators [6], two mirrors of an optical ring cavity [7], or two mirrors of two different cavities illuminated with entangled light beams [8]. Here we elaborate on these two latter schemes and propose a new double-cavity set-up able to generate a stationary entangled state of two vibrating cavity mirrors, exploiting the radiation pressure of the intracavity fields. Entanglement between mechanical degrees of freedom is achieved if the input fields are squeezed and if this squeezing is efficiently transferred to the movable mirrors. We show that a stationary entangled state can be generated with state-of-the-art apparata at cryogenic temperatures, and that it can be detected with a non-stationary homodyne measurement of the output light [9,10].

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confidence: 99%

mentioning

confidence: 99%

Entangling movable mirrors in a double-cavity system

Pinard¹,

Dantan²,

Vitali³

et al. 2005

Europhys. Lett.

208

195

View full text Add to dashboard Cite

show abstract

“…Candidates for a memory are largely divided into two categories: discrete variable systems such as an atom with distinct energy levels [1,2,3,4,5,6,7,8,9,10,11,12,13] and continuous variable systems such as an opto-mechanical oscillator with a vibration mode [14,15,16,17,18,19,20,21,22]. Remarkably, some experimental demonstrations of quantum state transfer have been reported [1,8,16,18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Transferring a quantum state of light to a memory is of particular importance for various purposes in quantum information technologies [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. Candidates for a memory are largely divided into two categories: discrete variable systems such as an atom with distinct energy levels [1,2,3,4,5,6,7,8,9,10,11,12,13] and continuous variable systems such as an opto-mechanical oscillator with a vibration mode [14,15,16,17,18,19,20,21,22].…”

Section: Introductionmentioning

confidence: 99%

Dynamical Gaussian state transfer with quantum-error-correcting architecture

Tajimi

Yamamoto

2012

Phys. Rev. A

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Transferring a quantum state of a light field to a memory is of particular importance. However, this transfer is usually hampered because the memory system is subjected to some noise and this can limit the performance of the state transfer to a great extent. In this paper, we consider the transfer of a Gaussian state of light to a linear medium memory such as an opto-mechanical oscillator and propose a dynamical feedback controller that suppresses the noise in the memory system. To protect an unknown state, the feedback scheme employs the specific configuration of the quantum error correction; that is, a three-mode Gaussian state having appropriate syndromes is taken as the input. Correspondingly, the memory consists of three independent linear systems. The syndrome errors are estimated continuously in time through the measurement of the output field, and the results are then fed back to control the system. Because the input is Gaussian and the systems are all linear, it is possible to formulate the problem using the framework of the celebrated classical Kalman filtering and linear quadratic Gaussian control. A numerical simulation demonstrates the effectiveness of the control scheme.

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“…Some authors have proposed to achieve this goal using interactions between atoms and light, where a quantum state exchange can take place [1,2,3,4,5], leading to the preparation of a desired collective spin state. A different set of proposals make use of an appropriate measurement on one of the field's observables that leads to the collapse of the ensemble onto the desired entangled spin state.…”

Section: Introductionmentioning

confidence: 99%

Atomic entanglement generation with reduced decoherence via four-wave mixing

Genes

Berman

2006

Phys. Rev. A

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In most proposals for the generation of entanglement in large ensembles of atoms via projective measurements, the interaction with the vacuum is responsible for both the generation of the signal that is detected and the spin depolarization or decoherence. In consequence, one has to usually work in a regime where the information aquisition via detection is sufficiently slow (weak measurement regime) such as not to strongly disturb the system. We propose here a four-wave mixing scheme where, owing to the pumping of the atomic system into a dark state, the polarization of the ensemble is not critically affected by spontaneous emission, thus allowing one to work in a strong measurement regime.

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Quantum-state transfer between fields and atoms in electromagnetically induced transparency

Cited by 107 publications

References 25 publications

Entangling movable mirrors in a double-cavity system

Entangling movable mirrors in a double-cavity system

Dynamical Gaussian state transfer with quantum-error-correcting architecture

Atomic entanglement generation with reduced decoherence via four-wave mixing

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