Coherent-state phase concentration by quantum probabilistic amplification

Marek, Petr; Filip, Radim

doi:10.1103/physreva.81.022302

Cited by 102 publications

(129 citation statements)

References 25 publications

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“…An X 2 M measurement can be used to conditionally prepare highly non-Guassian mechanical superposition states and experimentally characterizing the decoherence of such states is important to determine the feasibility of using mechanical elements for coherent quantum applications and can also be used to empirically test collapse models [49][50][51][52]. The pulsed measurements performed here may also be utilized for a QND-measurement-based lightmechanics quantum interface [53]. Furthermore, a sequence of four pulsed optomechanical interactions can be used to generate non-classical mechanical states of motion via an optomechanical geometric phase [54] and can even be used to experimentally explore potential quantum-gravitational phenomena [55].…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2013

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“…Of particular interest are those for which the success of the amplification process is heralded [3]. This includes techniques based on single-photon addition [4,5] or thermal noise addition followed by heralded photon subtraction [6,7].…”

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Heralded photon amplification for quantum communication

et al. 2012

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Heralded noiseless amplification based on single-photon sources and linear optics is ideally suited for longdistance quantum communication tasks based on discrete variables. We experimentally demonstrate such an amplifier, operating at telecommunication wavelengths. Coherent amplification is performed with a gain of G = 1.98 ± 0.20 for a state with a maximum expected gain G = 2. We also demonstrate that there is no need for a stable phase reference between the initial signal state and the local auxiliary photons used by the amplifier. We discuss these results in the context of experimental device-independent quantum key distribution based on heralded qubit amplification, and we highlight several key challenges for its realization.

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“…Many schemes work in postselection [9], that is, the generated state is accepted conditionally on a measurement outcome. The typical examples include photon addition and subtraction [10], and noise addition [11]. Among them, an interesting scheme was based on the quantum-scissors devices.…”

Section: Introductionmentioning

confidence: 99%

Thermal state truncation by using quantum-scissors device

Zhao

Yuan

2017

Optics Communications

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A non-Gaussian state being a mixture of the vacuum and single-photon states can be generated by truncating a thermal state in a quantum scissors device of Pegg et al. [Phys. Rev. Lett. 81 (1998) 1604. In contrast to the thermal state, the generated state shows nonclassical property including the negativity of Wigner function. Besides, signal amplification and signal-to-noise ratio enhancement can be achieved.

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Coherent-state phase concentration by quantum probabilistic amplification

Cited by 102 publications

References 25 publications

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

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

Heralded photon amplification for quantum communication

Thermal state truncation by using quantum-scissors device

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