System and method for communication between quantum controller modules

Patent metadata

Field	Value
Publication number	US-12494850-B2
Application number	US-202318134679-A
Country	US
Kind code	B2
Filing date	Apr 14, 2023
Priority date	Apr 28, 2021
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

A channel between quantum controller modules (e.g., pulse processors) is operable to communicate high speed data required for processing qubit states that may be distributed across a quantum computer. The latency of the communication channel is deterministic and controllable according to a system clock domain.

First claim

What is claimed is:

1 . A quantum controller comprising:
a pulse processor, wherein the pulse processor is operable to: generate a first plurality of data in parallel according to one or more responses from a first group of one or more qubits; and a transceiver, wherein the transceiver is operable to:
convert the first plurality of data into a first analog serial data stream,
transmit the first analog serial data stream over a first communication channel,
receive, via a second communication channel, a second analog serial data stream, and
convert the second analog serial data stream into a second plurality of data, wherein the pulse processor is operable to receive the second plurality of data in parallel to control a second group of one or more qubits.

2 . The quantum controller of claim 1 , wherein a full duplex channel comprises the first communication channel and the second communication channel.

3 . The quantum controller of claim 1 , wherein the pulse processor is operable to generate the first plurality of data according to a sync operation with another device.

4 . The quantum controller of claim 1 , wherein the pulse processor is operable to generate the first plurality of data according to a quantum state estimate of the first group of one or more qubits.

5 . The quantum controller of claim 1 , wherein the pulse processor is operable to generate an electromagnetic signal for transmission to a qubit in the second group of one or more qubits.

6 . The quantum controller of claim 1 , wherein the pulse processor is operable to generate an electromagnetic signal for transmission to a device that controls a qubit in the second group of one or more qubits, and wherein the device is operable to modulate a laser beam.

7 . The quantum controller of claim 1 , wherein the pulse processor is operable to generate the first plurality of data according to a resonator, and wherein the resonator is operable to generate an electromagnetic signal according a state of a qubit in the first group of one or more qubits.

8 . The quantum controller of claim 1 , wherein the transceiver comprises a phase shifter operable to receive the first plurality of data from the pulse processor according to a first clock domain and transmit the first analog serial data stream according to a second clock domain.

9 . The quantum controller of claim 1 , wherein the transceiver comprises a phase shifter operable to receive the second analog serial data stream according to a first clock domain and transfer the second plurality of data to the pulse processor according to a second clock domain.

10 . The quantum controller of claim 1 , wherein the first analog serial data stream and the second analog serial data stream are communicated at 16 Gb/s.

11 . The quantum controller of claim 1 , wherein the transceiver is synchronized to a system clock.

12 . The quantum controller of claim 1 , wherein upon initialization of the transceiver, a fixed latency is determined.

13 . The quantum controller of claim 12 , wherein the fixed latency is periodically monitored to identify errors, and wherein the transceiver is calibrated if the fixed latency is maintained during a monitoring period.

14 . The quantum controller of claim 1 , wherein upon initialization, the transceiver is operable to communicate according to one or more fixed latencies.

15 . The quantum controller of claim 12 , wherein upon initialization, the transceiver is operable to communicate according to a configured dynamic latency.

16 . The quantum controller of claim 1 , wherein a latency of the transceiver is dynamically modifiable.

17 . The quantum controller of claim 1 , wherein upon initialization, a plurality of transceivers are operable to communicate according to a fixed latency via a dedicated quantum control switch.

18 . The quantum controller of claim 1 , wherein a latency of the transceiver is operably aligned via a shared timestamp.

19 . The quantum controller of claim 1 , wherein the transceiver is stripped to a bare functionality to minimize a latency, and wherein the latency is periodically and dynamically tracked for errors.

20 . The quantum controller of claim 1 , wherein the transceiver comprises a phase shifter that is configured to write on a positive edge and read on a negative edge, and wherein a maximum clock domain crossing (CDC) transition is 1 clock cycle.

21 . A method for communicating within a quantum controller comprising:
converting a first plurality of data, from a first pulse processor, into a first analog signal representing a first serial data stream, wherein the first plurality of data is associated with a first group of one or more qubits, and wherein the conversion is at a first latency; transmitting the first analog signal representing the first serial data stream via a transmission medium; converting a second analog signal representing a second serial data stream into a second plurality of data, and wherein the conversion is at a second latency; controlling a second group of one or more qubits according to the second plurality of data; and monitoring for a variation between the first latency and the second latency.

22 . The method of claim 21 , wherein the method comprises generating the first plurality of data according to a quantum state estimate of the first group of one or more qubits.

23 . The method of claim 21 , wherein the method comprises generating a signal that controls the modulation of a laser beam.

24 . The method of claim 21 , wherein the method comprises generating a result according to the second plurality of data and a quantum state estimate of the second group of one or more qubits.

25 . The method of claim 21 , wherein the method comprises:
receiving the second plurality of data according to a first clock domain; and transferring the first plurality of data according to a second clock domain.

26 . The method of claim 25 , wherein the first analog signal representing the first serial data stream is transmitted according to a third clock domain.

27 . The method of claim 21 , wherein the method comprises communicating the first analog signal representing the first serial data stream over an optical fiber.

28 . The method of claim 21 , wherein the method comprises communicating the first serial data stream over the transmission medium at 16 Gb/s.

Assignees

• Quantum Machines
• Q M Tech Ltd

Inventors

• Sivan Itamar
• Cohen Yonatan
• Ofek Nissim
• Weber Ori
• Osi Guy

Classifications

• H04L7/0091

  Transmitter details · CPC title

• H04L7/0087

  Preprocessing of received signal for synchronisation, e.g. by code conversion, pulse generation or edge detection · CPC title

• G06N10/00

  Quantum computing, i.e. information processing based on quantum-mechanical phenomena · CPC title

• G06N10/70

  Quantum error correction, detection or prevention, e.g. surface codes or magic state distillation · CPC title

• H04B10/70 Primary

  Photonic quantum communication · CPC title