Efficient quantum computing using coherent photon conversion

Langford, Nathan K.; Ramelow, Sven; Prevedel, Robert; Munro, William J.; Milburn, G. J.; Zeilinger, Anton

doi:10.1038/nature10463

Cited by 152 publications

(150 citation statements)

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“…The potential of parametric interactions used for quantum information processing has been demonstrated in a variety of interesting experiments [12][13][14] . Although these interactions have been shown to preserve coherence [15][16][17] , they are generally performed using strong fields [18][19][20] .…”

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confidence: 99%

Interaction of independent single photons based on integrated nonlinear optics

et al. 2013

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The parametric interaction of light beams in nonlinear materials is usually thought to be too weak to be observed when the fields involved are at the single-photon level. However, such single-photon level nonlinearity is not only fundamentally fascinating but holds great potential for emerging technologies and applications involving heralding entanglement at a distance. Here we use a high-efficiency waveguide to demonstrate the sum-frequency generation between a single photon and a single-photon level coherent state. The use of an integrated, solid state, room temperature device and telecom wavelengths makes this type of system directly applicable to future quantum communication technologies such as device-independent quantum key distribution.

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confidence: 99%

Interaction of independent single photons based on integrated nonlinear optics

et al. 2013

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“…The implementation of a general mask would require the two photons to interact on the mask. This is not yet feasible with current technology, though progress is being made in this direction [17]. Nevertheless, even with linear masks, several important processing algorithms can still be implemented.…”

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confidence: 99%

Fourier processing of quantum light

Poem¹,

Gilead²,

Lahini³

et al. 2012

Phys. Rev. A

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It is shown that a classical optical Fourier processor can be used for the shaping of quantum correlations between two or more photons, and the class of Fourier masks applicable in the multiphoton Fourier space is identified. This concept is experimentally demonstrated using two types of periodic phase masks illuminated with path-entangled photon pairs, a highly non-classical state of light. Applied first were sinusoidal phase masks, emulating two-particle quantum walk on a periodic lattice, yielding intricate correlation patterns with various spatial bunching and anti-bunching effects depending on the initial state. Then, a periodic Zernike-like filter was applied on top of the sinusoidal phase masks. Using this filter, phase information lost in the original correlation measurements was retrieved.PACS numbers: 42.30. Kq, 42.50.Dv, 03.67.Ac, 03.67.Bg Fourier processing is a well-established method in signal processing, where a transformation is applied to the signal in the reciprocal Fourier domain. In classical optics, a lens converts an optical field in the back focal plane to its spatial Fourier transform at the front focal plane, where optical operations can be applied to directly manipulate the signal in the fourier domain [1]. This basic scheme has been used for the control and manipulation of the light intensity distribution in a number of optical signal processing methods, from matched filtering to phasecontrast microscopy [1]. One of the most frequently used setups is that of the 4-f filter, where a spatial mask at the common focal plane of two lenses performs the Fourier processing of the input signal (see inset in Fig. 1).In recent years, there is a growing interest in the generation, control and detection of non-classical, quantum light [2]. This is mostly due to its exciting applications in quantum information processing [3], quantum metrology [4], quantum imaging [5], and quantum lithography [6]. In contrast to classical light, many properties of quantum light cannot be revealed through first-order correlations, such as the light intensity, and require the measurement of higher order correlations [3,7]. Since optical Fourier processing proved to be a powerful tool for controlling the intensity distribution of classical light, examining the possibility of using this technique for the control of quantum correlations between photons seems very promising. This approach is further motivated by recent works applying Fourier optics to two photon states [8][9][10][11][12][13], where it was shown that the optical Fourier transform of two photons in one spatial dimension is given by the two-dimensional Fourier transform of the two-photon wavefunction [10,11].In this work, we first establish an analogy between the Fourier processing of classical light (intensity) to that of quantum light (correlations) by studying the effect of the Fourier-plane mask on photon correlations. We show that the effect of a one-dimensional mask in the space of the two-photon wavefunction is equivalent to the twodimensional, ext...

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“…Langford et al [123] introduced the concept of coherent photon conversion based on an ability to coherently control the exchange of photons between two optical modes. The defining Hamiltonian for the process is…”

Section: Coherent Photon Conversionmentioning

confidence: 99%

“…Langford et al [123] introduced a controlled beam splitter interaction to coherently control the conversion of photons between three optical modes as a route to generate and process complex, multi-quanta states for photonic quantum information applications. In this chapter, we consider this model as a quantum controlled beam splitter in which a mechanical degree of freedom controls a beam splitter interaction between two optical modes.…”

Section: Overviewmentioning

confidence: 99%

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Quantum measurement and control in single-photon opto-mechanics

Basiri-Esfahani¹

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Quantum opto-mechanics is a fast moving, broad research field which aims to investigate and control the interaction of light and the quantized motion of mechanical objects and the coupling between them. This allows one to engineer the mechanical quantum state by controlling and measuring the electromagnetic field, and conversely, to control the dynamical evolution of the optical field via its interaction with a mechanical system. Mechanical resonators are accessible in many different shapes and sizes, from kilogram scales in experiments that test gravitational theories to micro-and nano-scales in resolved sideband regime, where the frequency of the mechanical resonator is larger than the bandwidth of the optical cavity. In this regime, it is possible to cool the mechanical object to the ground state which allows a high degree of control and the ability to prepare interesting non-classical states, states that could aid in investigating the quantum dynamics of macroscopic objects. The field of quantum opto-mechanics is a promising testbed for quantum control technologies, such as fundamental tests of quantum mechanics, ultra-sensitive quantum sensors for precise measurements, phonon lasing, mechanical memories with long lifetime and quantum information processing. Furthermore, experiments are progressing toward strong opto-mechanical coupling regimes with single photons. This creates a platform that can take advantage of the nonlinear optical interactions to generate highly non-classical states in such light-matter interfaces. Photonic systems working in the single photon regime will be promising for low power applications and also for implementations of quantum information and computation.Motivated by these applications, this thesis consists of theoretical studies in the context of single photonics. This includes investigating non-classical mechanical state generation and mechanically controlling the dynamical evolution of optical fields in the strong coupling regime single photon opto-mechanics and furthermore, proposing a quantum sensor using single photonics. In this regard, we employ three important formalisms to treat and measure open quantum systems with non-Gaussian input fields: the conditional and unconditional cascaded master equations, Fock-state master equations and input-output Langevin equations. In the context of opto-mechanics, the system to be investigated is composed of two optical cavities with a coupling modulated via a mechanical resonator.In one case, a sequence of single photons are irreversibly sent to one of the optical cavities. After photons go through the opto-mechanical interaction, photon counting measurements are performed on the cavity output, conditionally steering the mechanical state to a highly nonclassical Fock state. Numerical calculations are performed to predict the experimental parameters needed to generate a mechanical Fock state before the mechanical object is thermalized.In another case, the same opto-mechanical scheme is employed to conversely modify the state ...

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Efficient quantum computing using coherent photon conversion

Cited by 152 publications

References 42 publications

Interaction of independent single photons based on integrated nonlinear optics

Interaction of independent single photons based on integrated nonlinear optics

Fourier processing of quantum light

Quantum measurement and control in single-photon opto-mechanics

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