Dipolar exchange quantum logic gate with polar molecules

Ni, Kang-Kuen; Rosenband, T.; Grimes, David

doi:10.1039/c8sc02355g

Cited by 227 publications

(240 citation statements)

References 58 publications

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“…The Deutsch algorithm provides a proofof-principle experiment to demonstrate the use of ultracold molecules to perform quantum computation. Scalability may be achieved in the future by implementing gates involving multiple molecules, confined in an array of tweezers and linked by the dipole-dipole interaction [63][64][65][66][67][68][69].…”

Section: Resultsmentioning

confidence: 99%

“…First, as explained in section 2, the noise in the intensity of tweezers leads to decoherence, which is in general more severe at high intensities. However, lowering the intensity increases the width of the external wavefunction of the molecule trapped in the tweezer [68]. This limits the proximity achievable before molecules can tunnel between tweezers and thus reduces the achievable dipole-dipole interactions.…”

Section: General Considerationsmentioning

confidence: 99%

“…Heteronuclear molecules can have electric dipole moments fixed in the molecular frame, allowing manipulation of the quantum states with microwave fields [57][58][59]62]. A quantum computer formed from ultracold polar molecules can be increased in scale by linking neighboring molecules via the long-range dipole-dipole interaction [63][64][65][66][67][68][69].…”

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confidence: 99%

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Ultracold polar molecules as qudits

et al. 2020

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We discuss how the internal structure of ultracold molecules, trapped in the motional ground state of optical tweezers, can be used to implement qudits. We explore the rotational, fine and hyperfine structure of 40 Ca 19 F and 87 Rb 133 Cs, which are examples of molecules with 2 Σ and 1 Σ electronic ground states, respectively. In each case we identify a subset of levels within a single rotational manifold suitable to implement a four-level qudit. Quantum gates can be implemented using two-photon microwave transitions via levels in a neighboring rotational manifold. We discuss limitations to the usefulness of molecular qudits, arising from off-resonant excitation and decoherence. As an example, we present a protocol for using a molecular qudit of dimension d=4 to perform the Deutsch algorithm.

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Section: Resultsmentioning

confidence: 99%

Section: General Considerationsmentioning

confidence: 99%

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Ultracold polar molecules as qudits

et al. 2020

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“…Many approaches to quantum computation have been explored in the last two decades, including trapped ions and neutral atoms [6][7][8][9], cavity QED and nonlinear optics [10][11][12], as well as superconducting circuits [13] and spin-based systems [14,15]. Approaches using ultracold polar molecules, in particular, have gained traction in recent years as a potential platform for QC [16][17][18][19][20][21][22]. Ultracold molecules could offer the coherence times of neutral atoms [23], and in addition, strong controllable long-range interactions [16,17,19].…”

Section: Introductionmentioning

confidence: 99%

A scalable quantum computing platform using symmetric-top molecules

et al. 2019

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We propose a new scalable platform for quantum computing (QC)-an array of optically trapped symmetric-top molecules (STMs) of the alkaline earth monomethoxide (MOCH 3 ) family. Individual STMs form qubits, and the system is readily scalable to 100-1000 qubits. STM qubits have desirable features for QC compared to atoms and diatomic molecules. The additional rotational degree of freedom about the symmetric-top axis gives rise to closely spaced opposite parity K-doublets that allow full alignment at low electric fields, and the hyperfine structure naturally provides magnetically insensitive states with switchable electric dipole moments. These features lead to much reduced requirements for electric field control, provide minimal sensitivity to environmental perturbations, and allow for 2-qubit interactions that can be switched on at will. We examine in detail the internal structure of STMs relevant to our proposed platform, taking into account the full effective molecular Hamiltonian including hyperfine interactions, and identify useable STM qubit states. We then examine the effects of the electric dipolar interaction in STMs, which not only guide the design of high-fidelity gates, but also elucidate the nature of dipolar exchange in STMs. Under realistic experimental parameters, we estimate that the proposed QC platform could yield gate errors at the 10 −3 level, approaching that required for fault-tolerant QC.

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“…In this regard, several different alternative logic gates have been investigated, such as nanotube gates, 2D materials logic gates, quantum logic gates, and biocircuits . For instance, quantum logic gates are scalable using existing silicon technologies, but they demand very low working temperatures . Biocircuits employ biological elements, which are difficult to control and are highly sensitive to working conditions including temperature, with the drawback of not being suitable for nowadays foundry processing lines since they require very different fabrication equipment facilities very different from the existing semiconductor foundry product lines .…”

Section: Introductionmentioning

confidence: 99%

Bottom‐Gate Approach for All Basic Logic Gates Implementation by a Single‐Type IGZO‐Based MOS Transistor with Reduced Footprint

Cunha

Guo

et al. 2020

Advanced Science

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Logic functions are the key backbone in electronic circuits for computing applications. Complementary metal‐oxide‐semiconductor (CMOS) logic gates, with both n‐type and p‐type channel transistors, have been to date the dominant building blocks of logic circuitry as they carry obvious advantages over other technologies. Important physical limits are however starting to arise, as the transistor‐processing technology has begun to meet scaling‐down difficulties. To address this issue, there is the crucial need for a next‐generation electronics era based on new concepts and designs. In this respect, a single‐type channel multigate MOS transistor (SMG‐MOS) is introduced holding the two important aspects of processing adaptability and low static dissipation of CMOS. Furthermore, the SMG‐MOS approach strongly reduces the footprint down to 40% or even less area needed for current CMOS logic function in the same processing technology node. Logic NAND, NOT, AND, NOR, and OR gates, which typically require a large number of CMOS transistors, can be realized by a single SMG‐MOS transistor. Two functional examples of SMG‐MOS are reported here with their analysis based both on simulations and experiments. The results strongly suggest that SMG‐MOS can represent a facile approach to scale down complex integrated circuits, enabling design flexibility and production rates ramp‐up.

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Dipolar exchange quantum logic gate with polar molecules

Abstract: Proposed molecular quantum gate takes advantage of internal coherence and resonant electric dipolar interaction with high fidelity and optical scalability.

Cited by 227 publications

References 58 publications

Ultracold polar molecules as qudits

Ultracold polar molecules as qudits

A scalable quantum computing platform using symmetric-top molecules

Bottom‐Gate Approach for All Basic Logic Gates Implementation by a Single‐Type IGZO‐Based MOS Transistor with Reduced Footprint

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