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Conference on Lasers and Electro-Optics

A Compact Orbital Angular Momentum Spectrometer Using Quantum Zeno Interrogation

Paul Bierdz, Hui Deng

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We present a scheme to measure the spectrum of orbital angular momenta of light using a precisely timed optical loop and quantum non-demolition measurements. We also discuss the influence of imperfect optical components.
DOI
10.1364/qels.2011.qthg4

Related papers

A compact orbital angular momentum spectrometer using quantum zeno interrogation

Paul Bierdz, Hui Deng

We present a scheme to measure the orbital angular momentum spectrum of light using a precisely timed optical loop and quantum non-demolition measurements. We also discuss the influence of imperfect optical components.

arXiv:1401.2559•Optics Express•Jun 1, 2011•10 citations

A Practical Orbital Angular Momentum Spectrometer using Time Mapping

Paul Bierdz, Hui Deng

We demonstrate a compact and practical orbital angular momentum spectrometer for arbitrary input states, based on an optical delay loop. Extinction ratios of 44-8.7 were measured, mainly limited by the available input states.

Conference on Lasers and Electro-Optics•Jan 1, 2012•0 citations

Measuring the Orbital Angular Momentum of Light with Time Mapping and Using it to Probe Higher Dimensional States.

Paul Bierdz

The orbital angular momentum of light (OAM) is a fundamental property of light. Beams with OAM have a helical wave front that carries quantized orbital angular momentum L hbar per photon, where L is any integer. This unbounded Hilbert space can increase information capacity of both classical and quantum communications and also improve and extend qubit and qudit quantum algorithms. Additionally, the use of the OAM modes allows for novel imaging techniques to directly observe and measure various topological properties of objects ranging from defects in semiconductors to rotating black holes and extrasolar planets. However, measuring such higher dimensional OAM states is fundamentally important, albeit challenging, in order to use this rich degree of freedom. In the work that follows, I present two novel OAM to time mapping schemes and an application using the higher dimensionality of OAM to non-destructively probe quantum states. These are the first OAM measuring schemes to use the temporal degree of freedom to measure OAM. The use of the novel loop nature allows for high fidelity and high speed measurements of a large number of OAM states without significant increase in experimental resources. The first scheme experimentally demonstrates a compact and practical device to measure the OAM spectrum. I report a fidelity of -21.3 dB for 5 different OAM states. The second scheme extends the first, but uses non-demolition measurements to iteratively test for specific OAM values. While this increases experimental complexity, it allows for the detection of an arbitrarily large OAM value from a single photon. I also discuss details of each technique investigate the affects of misalignment on the OAM spectrum. In the remaining part, I discuss my novel generalized quantum Zeno interrogation. The original quantum Zeno interrogation is limited to the two-dimensional state of a single object; while the generalized version has the ability to non-destructively probe the quantum state a set of objects, and deterministically imprint that information onto a single photon using the OAM degree of freedom.

•Jan 1, 2014•0 citations

High Fidelity Detection of the Orbital Angular Momentum of Light by Time Mapping

Paul Bierdz, Minho Kwon, Connor Roncaioli +1 more

Abstract. We demonstrate high-fidelity detection of the orbital angular momentum (OAM) of light using a compact and practical OAM spectrometer that maps the OAM spectrum to time. The spectrometer consists of a single optical delay loop to achieve timing mapping, a vortex phase plate that iteratively decreases the OAM value, and a single mode fibre to distinguish zero from non-zero OAM states. Light with arbitrarily OAM compositions can be measured. For light with OAM up to 4~, we measured an average crosstalk of-21.3 dB, which is mainly limited by the purity of the input states and optical alignment. ar X iv

•Aug 16, 2016•26 citations

High fidelity detection of the orbital angular momentum of light by time mapping

Paul Bierdz, Minho Kwon, Connor Roncaioli +1 more

We demonstrate high-fidelity detection of the orbital angular momentum (OAM) of light using a compact and practical OAM spectrometer that maps the OAM spectrum to time. The spectrometer consists of a single optical delay loop to achieve timing mapping, a vortex phase plate that iteratively decreases the OAM value and a single mode fiber to distinguish zero from non-zero OAM states. Light with arbitrarily OAM compositions can be measured. For light with OAM up to 4ℏ, we measured an average crosstalk of −21.3 dB, which is mainly limited by the purity of the input states and optical alignment.

arXiv:1309.2980•New Journal of Physics•Nov 29, 2013•30 citations

Single-shot measurement of the orbital-angular-momentum spectrum of light

Girish Ashok Kulkarni, Rishabh Sahu, Omar S. Magaña‐Loaiza +2 more

We propose a single-shot scheme to measure the orbital-angular-momentum (OAM) spectrum of a partially coherent field. We first test the scheme for a known field, and then use it to measure the OAM spectrum of the signal-idler field from parametric down-conversion with Schmidt number K = 82:1.

Conference on Lasers and Electro-Optics•Jan 1, 2018•3 citations
The orbital angular momentum of light (OAM) is a fundamental property of light. Beams with OAM have a helical wave front that carries quantized orbital angular momentum L hbar per photon, where L is any integer. This unbounded Hilbert space can increase information capacity of both classical and quantum communications and also improve and extend qubit and qudit quantum algorithms. Additionally, the use of the OAM modes allows for novel imaging techniques to directly observe and measure various topological properties of objects ranging from defects in semiconductors to rotating black holes and extrasolar planets. However, measuring such higher dimensional OAM states is fundamentally important, albeit challenging, in order to use this rich degree of freedom. In the work that follows, I present two novel OAM to time mapping schemes and an application using the higher dimensionality of OAM to non-destructively probe quantum states. These are the first OAM measuring schemes to use the temporal degree of freedom to measure OAM. The use of the novel loop nature allows for high fidelity and high speed measurements of a large number of OAM states without significant increase in experimental resources. The first scheme experimentally demonstrates a compact and practical device to measure the OAM spectrum. I report a fidelity of -21.3 dB for 5 different OAM states. The second scheme extends the first, but uses non-demolition measurements to iteratively test for specific OAM values. While this increases experimental complexity, it allows for the detection of an arbitrarily large OAM value from a single photon. I also discuss details of each technique investigate the affects of misalignment on the OAM spectrum. In the remaining part, I discuss my novel generalized quantum Zeno interrogation. The original quantum Zeno interrogation is limited to the two-dimensional state of a single object; while the generalized version has the ability to non-destructively probe the quantum state a set of objects, and deterministically imprint that information onto a single photon using the OAM degree of freedom.
Abstract. We demonstrate high-fidelity detection of the orbital angular momentum (OAM) of light using a compact and practical OAM spectrometer that maps the OAM spectrum to time. The spectrometer consists of a single optical delay loop to achieve timing mapping, a vortex phase plate that iteratively decreases the OAM value, and a single mode fibre to distinguish zero from non-zero OAM states. Light with arbitrarily OAM compositions can be measured. For light with OAM up to 4~, we measured an average crosstalk of-21.3 dB, which is mainly limited by the purity of the input states and optical alignment. ar X iv
We demonstrate high-fidelity detection of the orbital angular momentum (OAM) of light using a compact and practical OAM spectrometer that maps the OAM spectrum to time. The spectrometer consists of a single optical delay loop to achieve timing mapping, a vortex phase plate that iteratively decreases the OAM value and a single mode fiber to distinguish zero from non-zero OAM states. Light with arbitrarily OAM compositions can be measured. For light with OAM up to 4ℏ, we measured an average crosstalk of −21.3 dB, which is mainly limited by the purity of the input states and optical alignment.