Macroscopic non-classical states and terahertz quantum processing in room-temperature diamond

Lee, K. C.; Sussman, Benjamin J.; Sprague, Michael R.; Michelberger, Patrick; Reim, K.; Nunn, J.; Langford, Nathan K.; Bustard, Philip J.; Jaksch, Dieter; Walmsley, Ian A.

doi:10.1038/nphoton.2011.296

Cited by 125 publications

(127 citation statements)

References 28 publications

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“…The violation of the Cauchy-Schwarz inequality for the correlation functions seems to be the direct proof that we are really dealing with the frequency of events, but not with the probability at the delay time T = 1 ps. The given interpretation is confirmed by that, that at the delay time T = 5 − 6 ps, which is also shorter, than the coherence lifetime of the storage state |1 , evaluated to ≈ 7 ps, the system studied is obeing to the Cauchy-Schwarz inequality, that follows from the Figure 3b in [40], indicating, that by the given delay times, the notion of the probability can be used and the analysis of the authors is correct in this case.…”

Section: Analysis Of the Second Main Postulate And The Ways Of Qusupporting

confidence: 59%

“…The probability that the write pulse generates more than one phonon is therefore small. "To verify the non-classical nature of the state of the diamond crystal during storage",-the authors of [40] write,-"we evaluate the normalized cross-correlation of the Stokes and anti-Stokes fields, given by g S,AS ≤ g…”

Section: Analysis Of the Second Main Postulate And The Ways Of Qumentioning

confidence: 99%

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To Principles of Quantum Mechanics Development

Yerchuck¹,

Dovlatova²,

Borovik³

et al. 2014

IJP

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New insight to the principles of the quantum physics development is given. The correct ways for the construction of new versions of quantum mechanics on the second main postulate base are discussed.The conclusion on the status of the second main postulate is given. Its formulation in all textbooks has to be represented in the form of statement, since the hypothesis of Schrödinger on the existance of the field scalar function, being to be observable quantity, just charge density, is strictly proved for the case of EM-field, the role of which is argued to be decisive for the dynamics of the atomic systems. It is shown, that the field scalar function, being to be the function the only of coordinates and time, actually describes the state of the system. The second main postulate in Schrödinger formulation is mathematically strictly grounded, but in the popular probabilistic form used in modern textbooks on quantum theory it cannot be proved. The probabilistic theatise, proposed by Born is true in a number of special cases, quite correctly indicated by Dirac.The possible ways of the development of quantum theory, based on clear understanding of the origin of corpuscular-wave dualism are analysed.

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Section: Analysis Of the Second Main Postulate And The Ways Of Qusupporting

confidence: 59%

Section: Analysis Of the Second Main Postulate And The Ways Of Qumentioning

confidence: 99%

To Principles of Quantum Mechanics Development

Yerchuck¹,

Dovlatova²,

Borovik³

et al. 2014

IJP

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“…Using this back-action evading interaction we performed both state preparation and full state tomography of the mechanical motional state. We have reconstructed mechanical states with a position uncertainty reduced to 19 pm, limited by the quantum fluctuations of the optical pulse, and we have performed 'cooling-by-measurement' to reduce the mechanical mode temperature from an initial 1100 K to 16 K. Future improvements to this technique may allow for quantum squeezing of mechanical motion, even from room temperature, and reconstruction of non-classical states exhibiting negative regions in their phase-space quasi-probability distribution.Experiments are now beginning to investigate nonclassical motion of massive mechanical devices [1][2][3]. This opens up new perspectives for quantum-physics enhanced applications and for tests of the foundations of physics.…”

mentioning

confidence: 99%

“…Experiments are now beginning to investigate nonclassical motion of massive mechanical devices [1][2][3]. This opens up new perspectives for quantum-physics enhanced applications and for tests of the foundations of physics.…”

mentioning

confidence: 99%

Cooling-by-measurement and mechanical state tomography via pulsed optomechanics

et al. 2013

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Observing a physical quantity without disturbing it is a key capability for the control of individual quantum systems. Such back-action-evading or quantum-non-demolition measurements were first introduced in the 1970s in the context of gravitational wave detection to measure weak forces on test masses by high precision monitoring of their motion. Now, such techniques have become an indispensable tool in quantum science for preparing, manipulating, and detecting quantum states of light, atoms, and other quantum systems. Here we experimentally perform rapid optical quantumnoise-limited measurements of the position of a mechanical oscillator by using pulses of light with a duration much shorter than a period of mechanical motion. Using this back-action evading interaction we performed both state preparation and full state tomography of the mechanical motional state. We have reconstructed mechanical states with a position uncertainty reduced to 19 pm, limited by the quantum fluctuations of the optical pulse, and we have performed 'cooling-by-measurement' to reduce the mechanical mode temperature from an initial 1100 K to 16 K. Future improvements to this technique may allow for quantum squeezing of mechanical motion, even from room temperature, and reconstruction of non-classical states exhibiting negative regions in their phase-space quasi-probability distribution.Experiments are now beginning to investigate nonclassical motion of massive mechanical devices [1][2][3]. This opens up new perspectives for quantum-physics enhanced applications and for tests of the foundations of physics. A versatile approach to manipulate mechanical states of motion is provided by the interaction with electromagnetic radiation, typically confined to microwave or optical cavities. Such cavity-optomechanics experiments [4][5][6][7][8] have thus far largely concentrated on high sensitivity continuous monitoring of the mechanical position [9][10][11][12][13][14]. Because of the back-action imparted by the probe onto the measured object, the precision of such a measurement is fundamentally constrained by the standard quantum limit (SQL) [15,16], and therefore only allows for classical phase-space reconstruction [9,17,18]. In order to observe quantum mechanical features that are smaller than the mechanical zero-point motion, backaction-evading measurement techniques that can surpass the SQL [19,20] are required. Following the early insights of Braginsky, beating the standard quantum limit 'can be achieved only in one way: design the probe so it "sees" only the measured observable ' [15]. Such backaction evading techniques were first realized for the detection of optical quadratures [21][22][23] and have since been used for, e.g. precision measurement of atomic ensemble spin [24][25][26][27][28] and quantum non-demolition microwave photon counting [29]. In optomechanics, to perform a back-action evading measurement of the mechanical position, a time-dependent measurement scheme is required. One prominent example is the so-called 'two-tone app...

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“…Additionally, a QE-phonon interaction occurs in molecules and solids when the electronic and vibrational degrees of freedom are coupled, leading to inelastic scattering processes. Natural Raman transitions have been used to transfer a photon's quantum state to an optical phonon in diamond [13,14], but the extremely high frequency and large dissipation limit general applications for quantum processing.…”

mentioning

confidence: 99%

Coherent Atom-Phonon Interaction through Mode Field Coupling in Hybrid Optomechanical Systems

2017

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We propose a novel type of optomechanical coupling which enables a tripartite interaction between a quantum emitter, an optical mode and a macroscopic mechanical oscillator. The interaction uses a mechanism we term mode field coupling: mechanical displacement modifies the spatial distribution of the optical mode field, which in turn modulates the atom-photon coupling rate. In properly designed multimode optomechanical systems, we can achieve situations in which mode field coupling is the only possible interaction pathway for the system. This enables, for example, swapping of a single excitation between emitter and phonon, creation of nonclassical states of motion and mechanical ground-state cooling in the bad-cavity regime. Importantly, the emitter-phonon coupling rate can be enhanced through an optical drive field, allowing active control of strong atom-phonon coupling for realistic experimental parameters.

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Macroscopic non-classical states and terahertz quantum processing in room-temperature diamond

Cited by 125 publications

References 28 publications

To Principles of Quantum Mechanics Development

To Principles of Quantum Mechanics Development

Cooling-by-measurement and mechanical state tomography via pulsed optomechanics

Coherent Atom-Phonon Interaction through Mode Field Coupling in Hybrid Optomechanical Systems

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