WO2023234387A1 - Dispositif de commande d'entraînement pour éléments de bits quantiques - Google Patents

Dispositif de commande d'entraînement pour éléments de bits quantiques Download PDF

Info

Publication number
WO2023234387A1
WO2023234387A1 PCT/JP2023/020431 JP2023020431W WO2023234387A1 WO 2023234387 A1 WO2023234387 A1 WO 2023234387A1 JP 2023020431 W JP2023020431 W JP 2023020431W WO 2023234387 A1 WO2023234387 A1 WO 2023234387A1
Authority
WO
WIPO (PCT)
Prior art keywords
mixer
quantum bit
drive control
control device
local oscillator
Prior art date
Application number
PCT/JP2023/020431
Other languages
English (en)
Japanese (ja)
Inventor
健治 伊東
尚貴 坂井
誠 根耒
英久 塩見
真一 森榮
Original Assignee
学校法人金沢工業大学
国立大学法人大阪大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 学校法人金沢工業大学, 国立大学法人大阪大学 filed Critical 学校法人金沢工業大学
Publication of WO2023234387A1 publication Critical patent/WO2023234387A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits

Definitions

  • the present invention relates to a drive control device used to output arithmetic signals to quantum bit elements constituting a quantum computer.
  • a quantum computer is a computer that uses a large number of quantum bit devices to perform quantum operations using quantum algorithms.
  • Conventional computers use bits that take the value 0 or 1 as the unit of information, but since quantum bits can have a quantum mechanical superposition state of 0 and 1 in addition to the value 0 or 1, they are Since the number of parameters describing the system increases exponentially with respect to the number of components of the system, development is progressing at many research institutions.
  • Qubit devices which are currently being developed at many research institutions, are superconducting devices that must be installed inside a refrigerator, but in order to perform quantum operations, drive control is applied to each of the large number of qubit devices.
  • a device is required (Non-Patent Document 1).
  • the resonant frequency of the superconducting element differs for each quantum bit element, it is also necessary to prepare a carrier wave frequency used for inputting a calculation signal for each quantum bit element. Therefore, in order to put quantum computers into practical use in the future, it will be necessary to miniaturize the drive control device for each qubit element to enable high-density packaging in order to accommodate the increase in the number of bits. It is necessary to prevent interference due to so-called crosstalk within mutual boards or through space, which may cause calculation errors.
  • An object of the present invention is to provide a drive control device that can achieve high-density packaging and integration of quantum bit elements used for execution of arithmetic operations in a quantum computer.
  • a quantum bit drive control device includes a local oscillator and a quadrature mixer that orthogonally modulates an output signal of the local oscillator and an I/Q signal, and the quadrature mixer is an even harmonic quadrature mixer.
  • the drive control device for the quantum bit element is configured to transmit a calculation signal obtained by modulating an I signal (In-Phase) and a Q signal (Quadrature-Phase) into microwaves to a quantum bit device installed inside a refrigerator. It is transmitted to a bit element, and the result executed by this quantum bit element is taken into an external computer etc. by microwave demodulation processing. Therefore, in order to perform arithmetic processing using a quantum computer, it is necessary to drive and control many quantum bit elements. At this time, it is important to prevent interference (crosstalk) between microwave devices for driving quantum bit devices.
  • the present invention is characterized in that an even harmonic mixer circuit is used to generate a microwave modulated wave.
  • the even harmonic mixer can produce a transmission frequency that is a mixture of a frequency twice the local oscillation frequency and an intermediate frequency due to a doubling effect.
  • this local oscillation frequency is equal to the frequency of the carrier wave output from the even harmonic mixer. It becomes half the frequency.
  • the crosstalk between the quantum bit element QBIT1 and the quantum bit element QBIT2 will be explained based on FIG. 1 as follows. If the frequencies of the wave sources generated by PLL1 and PLL2 are fp1 and fp2 corresponding to each of the above-mentioned quantum bit elements, an even harmonic quadrature mixer is used to convert the I/Q signal through a DAC (Digital Analog Converter).
  • DAC Digital Analog Converter
  • the modulated calculation signals become 2fp1 ⁇ fbb and 2fp2 ⁇ fbb.
  • a predetermined bandpass filter (BPF) is used to output a calculated signal, and in the passband of the BPF of QBIT1, a mixture of 2fp2 and fp1+fp2 is assumed for 2fp1 ⁇ fbb.
  • the sum of all orders is an even number and is strongly suppressed by using an even harmonic mixer.
  • an anti-parallel diode is used as an even harmonic mixer, the amount of suppression is usually about 70 dB by matching the characteristics of the two diodes.
  • the present invention includes a local oscillator and a quadrature mixer that orthogonally modulates an output signal of the local oscillator and an I/Q signal, and as a means for frequency converting the quadrature modulated signal obtained by the quadrature mixer, even harmonics are used.
  • a heterodyne configuration with a mixer may also be used.
  • an even high frequency mixer can be used when performing I/Q quadrature modulation at a low frequency and converting it to a high frequency.
  • the present invention includes a local oscillator and an SSB mixer for SSB (Single Side-Band) modulation of an output signal of the local oscillator and an intermediate frequency signal, and the SSB mixer uses an even harmonic mixer.
  • SSB Single Side-Band
  • an even harmonic mixer is used as a modulation signal, and Hilbert transform or the like is performed on the output signal from the local oscillator.
  • the SSB mixer is constructed based on the even harmonic mixer.
  • a configuration may be used in which an even harmonic quadrature mixer is used after Hilbert transformation using a Hilbert filter.
  • the present invention is effective in suppressing mutual crosstalk by being composed of a plurality of quantum bit devices and providing the drive control device for each quantum bit device.
  • the present invention utilizes an even harmonic quadrature mixer to generate a modulation waveform between an output signal from a local oscillator and an I/Q signal as a drive control device for a qubit device in multi-bit qubit devices.
  • an even harmonic mixer is incorporated in frequency conversion or SSB modulation, mutual crosstalk can be prevented, making high-density packaging and integration easier.
  • FIG. 1 shows an example of a drive control device for a quantum bit element with a heterodyne configuration according to the present invention.
  • An example of the configuration of a conventional quantum bit device driving device is shown.
  • An example of a drive control device for a quantum bit element with a conventional heterodyne configuration is shown.
  • An example of an SSB mixer based on an even harmonic mixer is shown. An example will be shown in which an even harmonic mixer is used after SSB modulation using a Hilbert filter.
  • FIG. 1 shows a configuration example of a quantum bit element drive control device according to the present invention
  • FIG. 5 shows a conventional configuration example for comparison.
  • the I/Q signal was converted into a DAC (Digital Analog Connerter) and orthogonally modulated using a local oscillation carrier wave stabilized by a PLL circuit and a quadrature mixer.
  • a frequency fp1 ⁇ fbb is output to the quantum bit element QBIT2, and a frequency fp2 ⁇ fbb is output to the quantum bit element QBIT2.
  • the present invention is characterized in that an even harmonic quadrature mixer is used instead of the quadrature mixer shown in FIG.
  • a number of qubit devices are provided for performing operations with the qubit devices.
  • an I/Q signal is DAC-converted, and an output signal from a reference oscillator is orthogonally modulated with an output frequency from a local oscillator obtained using a PLL circuit using an even harmonic quadrature mixer.
  • the even harmonic mixer may be an anti-parallel diode shown in FIG. 2, or may be configured with a ring diode or a pair of FETs.
  • an anti-parallel diode pair When an anti-parallel diode pair is used, the diodes are turned on and off every half cycle, so there is a doubling effect, and half of the waves are canceled inside the diode pair. Therefore, the output frequency fout is suppressed when
  • FIG. 3 shows an explanatory diagram of the operation of the even harmonic quadrature mixer. Thereby, X1(t) and X2(t) can be modulated to arbitrary amplitudes and phases.
  • FIG. 4 shows an example of a drive control device for a quantum bit device according to the present invention having a heterodyne configuration.
  • a drive control device for a quantum bit device having a heterodyne configuration.
  • FIG. 6 shows an example of a conventional configuration.
  • QBIT1 even if the frequency fpa1 ⁇ fbb, etc., which is orthogonally modulated by the orthogonal mixer, is converted to a high frequency by the fundamental mixer to fpb1 ⁇ fpa1 ⁇ fbb, the frequencies of fbb2, fpb1, etc.
  • FIG. 7 shows an example in which an even harmonic mixer is incorporated as a structure when performing SSB modulation
  • FIG. 8 shows an example in which a Hilbert filter is used as a structure in SSB modulation.
  • the drive control device for quantum bit elements enables high-density packaging and integration, and is expected to be applied to quantum computers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

[Problème] Fournir un dispositif de commande d'entraînement capable d'obtenir un montage et une intégration à haute densité d'éléments de bits quantiques utilisés pour exécuter une opération arithmétique par un ordinateur quantique. [Solution] La présente invention comprend un oscillateur local et un mélangeur en quadrature qui applique la modulation en quadrature à un signal de sortie de l'oscillateur local et des signaux I/Q et est caractérisé en ce que le mélangeur en quadrature représente un mélangeur en quadrature d'harmoniques paires.
PCT/JP2023/020431 2022-06-03 2023-06-01 Dispositif de commande d'entraînement pour éléments de bits quantiques WO2023234387A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022090548 2022-06-03
JP2022-090548 2022-06-03

Publications (1)

Publication Number Publication Date
WO2023234387A1 true WO2023234387A1 (fr) 2023-12-07

Family

ID=89024976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/020431 WO2023234387A1 (fr) 2022-06-03 2023-06-01 Dispositif de commande d'entraînement pour éléments de bits quantiques

Country Status (1)

Country Link
WO (1) WO2023234387A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5416449A (en) * 1994-05-23 1995-05-16 Synergy Microwave Corporation Modulator with harmonic mixers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5416449A (en) * 1994-05-23 1995-05-16 Synergy Microwave Corporation Modulator with harmonic mixers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PARK JONGSEOK; SUBRAMANIAN SUSHIL; LAMPERT LESTER; MLADENOV TODOR; KLOTCHKOV ILYA; KURIAN DILEEP J.; JUAREZ-HERNANDEZ ESDRAS; ESPA: "A Fully Integrated Cryo-CMOS SoC for State Manipulation, Readout, and High-Speed Gate Pulsing of Spin Qubits", IEEE JOURNAL OF SOLID-STATE CIRCUITS, IEEE, USA, vol. 56, no. 11, 1 November 2021 (2021-11-01), USA, pages 3289 - 3306, XP011885423, ISSN: 0018-9200, DOI: 10.1109/JSSC.2021.3115988 *

Similar Documents

Publication Publication Date Title
US6127899A (en) High frequency anharmonic oscillator for the generation of broadband deterministic noise
US6850749B2 (en) Local oscillator architecture to reduce transmitter pulling effect and minimize unwanted sideband
US6560297B1 (en) Image rejection downconverter for a translation loop modulator
KR940005374B1 (ko) Fm 변조기
US8693959B1 (en) System and apparatus for a direct conversion receiver and transmitter
CA2617006C (fr) Diviseurs de frequence regenerateurs complexes a faible bruit a large bande
US7804911B2 (en) Dual demodulation mode AM radio
WO2023234387A1 (fr) Dispositif de commande d'entraînement pour éléments de bits quantiques
GB2247368A (en) Phase modulation signal generator
JPH1117749A (ja) 復調回路
CN115856738A (zh) 磁共振系统及其射频发射机
KR100473131B1 (ko) 통신 장치
US6043926A (en) Electro-optical broadband microwave frequency shifter
EP4278441A1 (fr) Émetteur à multiples trajets de signal
CN209930271U (zh) 一种目标频段量子比特逻辑信号的生成系统
US20040014446A1 (en) Methods and systems for odd-order LO compensation for even-harmonic mixers
US6072374A (en) FM modulation system using quadrature modulator
US11774478B2 (en) Low power wideband multitone generator
JPH10303650A (ja) 周波数変換器
JPH0360502A (ja) ディジタル式ｆｍ変調器
US20090002065A1 (en) Buffer circuit for reducing differential-mode phase noise and quadrature phase error
KR100186600B1 (ko) 변조기의 잡음제거장치 및 방법
JP2011244393A (ja) 周波数変調器
GB2163626A (en) FSK generator
Patel 9 Frequency Synthesizers

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23816144

Country of ref document: EP

Kind code of ref document: A1