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Dhingra A, Hu X, Borunda MF, Johnson JF, Binek C, Bird J, N'Diaye AT, Sutter JP, Delahaye E, Switzer ED, Barco ED, Rahman TS, Dowben PA. Molecular transistors as substitutes for quantum information applications. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:441501. [PMID: 35998608 DOI: 10.1088/1361-648x/ac8c11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
Applications of quantum information science (QIS) generally rely on the generation and manipulation of qubits. Still, there are ways to envision a device with a continuous readout, but without the entangled states. This concise perspective includes a discussion on an alternative to the qubit, namely the solid-state version of the Mach-Zehnder interferometer, in which the local moments and spin polarization replace light polarization. In this context, we provide some insights into the mathematics that dictates the fundamental working principles of quantum information processes that involve molecular systems with large magnetic anisotropy. Transistors based on such systems lead to the possibility of fabricating logic gates that do not require entangled states. Furthermore, some novel approaches, worthy of some consideration, exist to address the issues pertaining to the scalability of quantum devices, but face the challenge of finding the suitable materials for desired functionality that resemble what is sought from QIS devices.
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Affiliation(s)
- Archit Dhingra
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, United States of America
| | - Xuedong Hu
- Department of Physics, University at Buffalo, Buffalo, NY, 14260-1500, United States of America
| | - Mario F Borunda
- Department of Physics, Oklahoma State University, Stillwater, OK 74078, United States of America
| | - Joseph F Johnson
- Department of Mathematics & Statistics, Villanova University, 800 E. Lancaster Ave., Villanova, PA 19085, United States of America
| | - Christian Binek
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, United States of America
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, United States of America
| | - Jonathan Bird
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260-1900, United States of America
| | - Alpha T N'Diaye
- Advanced Light Source (ALS, BL631), Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| | - Jean-Pascal Sutter
- Laboratoire de Chimie de Coordination du CNRS (LCC-CNRS), Université de Toulouse, CNRS, F-31000 Toulouse, France
| | - Emilie Delahaye
- Laboratoire de Chimie de Coordination du CNRS (LCC-CNRS), Université de Toulouse, CNRS, F-31000 Toulouse, France
| | - Eric D Switzer
- Department of Physics, University of Central Florida, Orlando, FL 32816, United States of America
| | - Enrique Del Barco
- Department of Physics, University of Central Florida, Orlando, FL 32816, United States of America
| | - Talat S Rahman
- Department of Physics, University of Central Florida, Orlando, FL 32816, United States of America
| | - Peter A Dowben
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, United States of America
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Kwon O, Park KK, Ra YS, Kim YS, Kim YH. Time-bin entangled photon pairs from spontaneous parametric down-conversion pumped by a cw multi-mode diode laser. OPTICS EXPRESS 2013; 21:25492-25500. [PMID: 24150388 DOI: 10.1364/oe.21.025492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Generation of time-bin entangled photon pairs requires the use of the Franson interferometer which consists of two spatially separated unbalanced Mach-Zehnder interferometers through which the signal and idler photons from spontaneous parametric down-conversion (SPDC) are made to transmit individually. There have been two SPDC pumping regimes where the scheme works: the narrowband regime and the double-pulse regime. In the narrowband regime, the SPDC process is pumped by a narrowband cw laser with the coherence length much longer than the path length difference of the Franson interferometer. In the double-pulse regime, the longitudinal separation between the pulse pair is made equal to the path length difference of the Franson interferometer. In this paper, we propose another regime by which the generation of time-bin entanglement is possible and demonstrate the scheme experimentally. In our scheme, differently from the previous approaches, the SPDC process is pumped by a cw multi-mode (i.e., short coherence length) laser and makes use of the coherence revival property of such a laser. The high-visibility two-photon Franson interference demonstrates clearly that high-quality time-bin entanglement source can be developed using inexpensive cw multi-mode diode lasers for various quantum communication applications.
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Yarnall T, Abouraddy AF, Saleh BEA, Teich MC. Spatial coherence effects on second- and fourth-order temporal interference. OPTICS EXPRESS 2008; 16:7634-7640. [PMID: 18545470 DOI: 10.1364/oe.16.007634] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report the results of two experiments performed with two-photon light, produced via collinear degenerate optical spontaneous parametric downconversion (SPDC), in which both second-order (one-photon) and fourth-order (two-photon) interferograms are recorded in a Mach-Zehnder interferometer (MZI). In the first experiment, high-visibility fringes are obtained for both the second- and fourth-order interferograms. In the second experiment, the MZI is modified by the removal of a mirror from one of its arms; this leaves the fourth-order interferogram unchanged, but extinguishes the second-order interferogram. A theoretical model that takes into consideration both the temporal and spatial degrees-of-freedom of the two-photon state successfully explains the results. While the temporal interference in the MZI is independent of the spatial coherence of the source, that of the modified MZI is not.
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Affiliation(s)
- Timothy Yarnall
- Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, Massachusetts 02420-9108, USA
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Bellini M, Marin F, Viciani S, Zavatta A, Arecchi FT. Nonlocal pulse shaping with entangled photon pairs. PHYSICAL REVIEW LETTERS 2003; 90:043602. [PMID: 12570422 DOI: 10.1103/physrevlett.90.043602] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2002] [Indexed: 05/23/2023]
Abstract
Nonlocal shaping effects in the time or spectral profiles of an entangled photon pair emerging from a pulsed parametric down-converter are observed by spectrally or temporally filtering one of the twin beams. In particular, we demonstrate the appearance of fourth-order ("ghost") interference fringes in the spectrum of one beam conditioned by photodetection at the output of an unbalanced Michelson interferometer placed in the path of the other beam. The coherence time of the pump is the limiting factor for the sharpness of the details in the shaped biphoton spectrum.
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Affiliation(s)
- M Bellini
- Istituto Nazionale di Ottica Applicata, Largo E. Fermi, 6, I-50125, Florence, Italy
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Atatüre M, Sergienko AV, Saleh BE, Teich MC. Entanglement in cascaded-crystal parametric down-conversion. PHYSICAL REVIEW LETTERS 2001; 86:4013-4016. [PMID: 11328083 DOI: 10.1103/physrevlett.86.4013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2000] [Indexed: 05/23/2023]
Abstract
We use spontaneous parametric down-conversion in a cascade of crystals, driven by a single monochromatic cw pump laser, to study the interference of entangled photon pairs. By changing the distance between the crystals, the observed quantum interference pattern varies continuously from that associated with a longer single crystal to that associated with independent emissions from two distinct crystals. Postselection via spectral filtering suppresses this phenomenon. These findings are expected to advance the field of quantum-state engineering.
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Affiliation(s)
- M Atatüre
- Quantum Imaging Laboratory, Department of Electrical & Computer Engineering, Boston University, 8 Saint Mary's Street, Boston, Massachusetts 02215, USA
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Pittman TB, Strekalov DV, Klyshko DN, Rubin MH, Sergienko AV, Shih YH. Two-photon geometric optics. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 53:2804-2815. [PMID: 9913196 DOI: 10.1103/physreva.53.2804] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
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Pittman TB, Shih YH, Strekalov DV, Sergienko AV. Optical imaging by means of two-photon quantum entanglement. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 52:R3429-R3432. [PMID: 9912767 DOI: 10.1103/physreva.52.r3429] [Citation(s) in RCA: 449] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2023]
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Tara K, Agarwal GS. Einstein-Podolsky-Rosen paradox for continuous variables using radiation fields in the pair-coherent state. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 50:2870-2875. [PMID: 9911225 DOI: 10.1103/physreva.50.2870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Franson JD, Lives H. Quantum cryptography using optical fibers. APPLIED OPTICS 1994; 33:2949-2954. [PMID: 20885657 DOI: 10.1364/ao.33.002949] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Quantum cryptography permits the transmission of secret information whose security is guaranteed by the uncertainty principle. An experimental system for quantum crytography is implemented based on the linear polarization of single photons transmitted by an optical fiber. Polarization-preserving optical fiber and a feedback loop are employed to maintain the state of polarization. Error rates of less than 0.5% are obtained.
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Larchuk TS, Campos RA, Rarity JG, Tapster PR, Jakeman E, Saleh BE, Teich MC. Interfering entangled photons of different colors. PHYSICAL REVIEW LETTERS 1993; 70:1603-1606. [PMID: 10053337 DOI: 10.1103/physrevlett.70.1603] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Shih YH, Sergienko AV, Rubin MH. Einstein-Podolsky-Rosen state for space-time variables in a two-photon interference experiment. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:1288-1293. [PMID: 9909054 DOI: 10.1103/physreva.47.1288] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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