Continuous-Variable Quantum Computing in Optical Time-Frequency Modes Using Quantum Memories

Humphreys, Peter C.; Kolthammer, W. Steven; Nunn, Joshua; Barbieri, Marco; Datta, Animesh; Walmsley, Ian A.

doi:10.1103/physrevlett.113.130502

Cited by 64 publications

(56 citation statements)

References 53 publications

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“…Such schemes have recently been proposed in the general context of QIS as well [56,57]. However, they are not based on genuinely field-orthogonal modes, which translates to a lower "packing density" of signal channels in time-frequency space to ensure approximate orthogonality.…”

Section: Quantum Communicationmentioning

confidence: 99%

Photon Temporal Modes: A Complete Framework for Quantum Information Science

et al. 2015

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Field-orthogonal temporal modes of photonic quantum states provide a new framework for quantum information science (QIS). They intrinsically span a high-dimensional Hilbert space and lend themselves to integration into existing single-mode fiber communication networks. We show that the three main requirements to construct a valid framework for QIS-the controlled generation of resource states, the targeted and highly efficient manipulation of temporal modes, and their efficient detection-can be fulfilled with current technology. We suggest implementations of diverse QIS applications based on this complete set of building blocks.

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Section: Quantum Communicationmentioning

confidence: 99%

Photon Temporal Modes: A Complete Framework for Quantum Information Science

et al. 2015

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“…Quantum photonic technology research is increasingly focusing on ultrashort optical pulsed modes due to their high information content and their compatability with integrated optical platforms. The time-frequency (TF) degree of freedom constitutes an infinite Hilbert space [1], allowing an information content per photon limited only by the encoder and detector resolution. Accessing the information contained in both the spectral amplitude and phase domains of ultrafast pulsed modes of quantum light raises the possibility of surpassing the standard quantum limit in precision measurements such as pulse time-of-flight [2] and atmospheric characteristics [3].…”

mentioning

confidence: 99%

Experimental single-photon pulse characterization by electro-optic shearing interferometry

2018

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The ability to characterize the complete quantum state of light is essential for both fundamental and applied science. For single photons the quantum state is provided by the mode that it occupies. The spectral temporal mode structure of light has recently emerged as an essential means for quantum information science. Here we experimentally demonstrate a self-referencing technique to completely determine the pulse-mode structure of single photons by means of spectral shearing interferometry. We detail the calibration and resolution of the measurement and discuss challenges and critical requirements for future advances of this method.Quantum photonic technology research is increasingly focusing on ultrashort optical pulsed modes due to their high information content and their compatability with integrated optical platforms. The time-frequency (TF) degree of freedom constitutes an infinite Hilbert space [1], allowing an information content per photon limited only by the encoder and detector resolution. Accessing the information contained in both the spectral amplitude and phase domains of ultrafast pulsed modes of quantum light raises the possibility of surpassing the standard quantum limit in precision measurements such as pulse time-of-flight [2] and atmospheric characteristics [3]. Furthermore, the freedom to encode quantum information in multiple spectral-temporal modes, and then to recover that information, extends the usefulness of quantum secure information protocols such as quantum key distribution (QKD) [4]. However, for these advantages to be exploited, complete and reliable characterization techniques of quantum light pulses are required.Quantum optical technologies involve three experimental stages: state preparation, state evolution or active manipulation, and ultimately measurement. The ability to accurately characterize the quantum state of light is crucial for developing all three stages of optical quantum technologies. Firstly, the development of nonclassical light sources requires complete characterization of the optical field output to certify the output light matches the desired quantum state [5]. Secondly, verifying operations that manipulate the quantum state of light requires full characterization of a complete set of probe states [6]. This forms the basis of optical quantum process tomography. Finally, the development of new quantum optical detectors requires the ability to probe the detector response with a complete set of probe states, a technique known as quantum detector tomography. The set of probe states can be verified by first using a previously calibrated detector.The pulse envelope of ultrashort optical pulses varies on a time scale far shorter than the response time of the best photodetectors, making direct sampling of the temporal intensity of ultrashort optical pulses infeasible. Moreover, full reconstruction of an optical pulse train necessitates knowledge of its spectral or temporal phase even if the amplitude is known in both the time and frequency domains [7]. Although signi...

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“…An important goal in quantum information science and technology is complete control of photonic states [1]. Beyond the polarization and transverse spatial degrees of freedom, the time-frequency degree of freedom is largely an untapped quantum resource [2][3][4][5]. Orthogonal temporal modes (TMs) are defined by the complex longitudinal wave-packet shape functions of pulsed modes of light [6].…”

mentioning

confidence: 99%

Photonic temporal-mode multiplexing by quantum frequency conversion in a dichroic-finesse cavity

Reddy

Raymer

2018

Opt. Express

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Photonic temporal modes (TMs) form a field-orthogonal, continuous-variable degree of freedom that is in principle infinite dimensional, and create a promising resource for quantum information science and technology. The ideal quantum pulse gate (QPG) is a device that multiplexes and demultiplexes temporally orthogonal optical pulses that have the same carrier frequency, spatial mode, and polarization. The QPG is the chief enabling technology for usage of orthogonal temporal modes as a basis for high-dimensional quantum information storage and processing. The greatest hurdle for QPG implementation using nonlinear-optical, parametric processes with time-varying pump or control fields is the limitation on achievable temporal mode selectivity, defined as perfect TM discrimination combined with unity efficiency. We propose the use of pulsed nonlinear frequency conversion in an optical cavity having greatly different finesses for different frequencies to implement a nearly perfectly TM-selective QPG in a low-loss integrated-optics platform.

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Continuous-Variable Quantum Computing in Optical Time-Frequency Modes Using Quantum Memories

Cited by 64 publications

References 53 publications

Photon Temporal Modes: A Complete Framework for Quantum Information Science

Photon Temporal Modes: A Complete Framework for Quantum Information Science

Experimental single-photon pulse characterization by electro-optic shearing interferometry

Photonic temporal-mode multiplexing by quantum frequency conversion in a dichroic-finesse cavity

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