IP Library › Granted Patent US 12,548,688
Granted Patent B2
US 12,548,688 · App. 17/573,270 · Granted Feb 10, 2026

System and method for parallel implementation of multi-qubit quantum gates

Inventors: Hannes Pichler (Pasadena, CA); Harry Jay Levine (Cambridge, MA); Mikhail D. Lukin (Cambridge, MA); Ahmed Omran (Cambridge, MA); Alexander Keesling Contreras (Cambridge, MA); Giulia Semeghini (Cambridge, MA); Vladan Vuletic (Cambridge, MA); Markus Greiner (Cambridge, MA); Tout Wang (Cambridge, MA); Sepehr Ebadi (Cambridge, MA)
Assignees: President and Fellows of Harvard College; Massachusetts Institute of Technology
G21K1/006G06N10/20G06N10/40
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Quick Facts
Patent No.
US 12,548,688
App. No.
17/573,270
Granted
Feb 10, 2026
Kind
B2
Abstract

A device includes a grouping of N qubits, where N is equal to two or more, and a coherent light source configured to, given selected values for a set of parameters of at least a first and a second laser pulse, the parameters selected from a relative phase shift, a laser frequency, a laser intensity, and a pulse duration: apply at least the first and second laser pulses to all qubits within the grouping of N qubits, thereby coupling a non-interacting quantum state |1 to an interacting excited state |r , such that each qubit that begins in quantum state |1 returns to the state |1 upon completion of the at least first and second laser pulses, and such that qubits in the grouping are mutually blockaded.

Claims (36)

1 . A method of operating a quantum gate on a grouping of qubits, the method comprising:

selecting values for a set of parameters of at least a first and a second laser pulse, wherein the set of parameters incldues a relative phase shift between at least the first and second laser pulses, a laser frequency, a laser intensity, and a pulse duration; and

sequentially applying the at least first and second laser pulses each to all qubits within a grouping of N qubits, where N is equal to two or more, thereby coupling a non-interacting quantum state |1 to an interacting excited state |r , such that each qubit that begins in quantum state |1 returns to the state |1 upon completion of the at least first and second laser pulses, and wherein all qubits in the grouping are mutually blockaded.

2 . The method of claim 1 , wherein each qubit is an atomic qubit, an ionic qubit, or a molecular qubit.

3 . The method of claim 1 , wherein the mutually blockaded qubits in the grouping are mutually dipole blockaded.

4 . The method of claim 1 , wherein the mutually blockaded qubits in the grouping are mutually Rydberg blockaded.

5 . The method of claim 1 , wherein the pulse durations of the at least the first and the second pulses are selected so that when all qubits in the grouping begin in the quantum state |1 , then all qubits in the grouping return to the quantum state |1 upon completion of each of the at least the first and the second laser pulses.

6 . The method of claim 5 , wherein the laser frequency of each laser pulse is detuned from a resonance transition between |1 to |r by a detuning Δ, and the pulse duration t is equal to t=2 π/√{square root over (Δ 2 +NΩ 2 )}, where Ω is a Rabi frequency of each laser pulse.

7 . The method of claim 1 , wherein one or more of the laser intensity, the laser frequency, the pulse duration, and the relative phase shift is selected to achieve a desired fidelity of the quantum gate.

8 . The method of claim 1 , wherein the at least the first and the second laer pulses form a palindromic sequence of pulses.

9 . The method of claim 1 , wherein the quantum gate is a controlled-phase gate C N-1 Z(θ), wherein θ is a conditional-phase angle.

10 . The method of claim 9 , wherein the quantum gate is a controlled phase (CZ(θ)) gate, and N=2.

11 . The method of claim 10 , wherein the laser frequency, the pulse duration, and the relative phase shift are selected based on the conditional-phase angle θ of the controlled phase gate.

12 . The method of claim 11 , wherein the laser frequency is detuned from a resonance transition between |1 to |r by a detuning Δ, and the laser intensity is selected such that a Rabi frequency of the at least the first and the second laser pulses is Ω.

13 . The method of claim 12 , wherein the laser frequency, the laser intensity, the pulse duration, and the relative phase shift are selected such that the conditional-phase angle θ=π.

14 . The method of claim 9 , wherein the laser frequency, pulse duration, and relative phase shift of each of the at least the first and second laser pulses are selected based on the conditional-phase angle θ.

15 . The method of claim 1 , wherein N is 3 and the quantum gate is a controlled-controlled phase (C 2 Z(θ)) gate having a conditional-phase angle θ.

16 . The method of claim 1 , wherein N is 3, the method comprises applying a sequence of six pulses, and the sequence of six pulses is palindromic.

17 . The method of claim 1 , the method comprising applying a sequence of 4N−6 pulses.

18 . The method of claim 17 , wherein the sequence of pulses is palindromic.

19 . A method of operating a quantum gate on a grouping of qubits, the method comprising:

selecting time-dependent values for a set of parameters of a laser pulse, wherein the set of parameters includes a laser phase, a laser frequency, a laser intensity, and a pulse duration; and

applying the laser pulse to all qubits within a grouping of N qubits, where N is equal to three or more, thereby coupling a non-interacting quantum state |1 to an interacting excited state |r , such that each qubit that begins in quantum state |1 returns to the quantum state |1 upon completion of the laser pulse, and wherein all qubits in the grouping are mutually blockaded.

20 . The method of claim 19 , wherein the time-dependent values of the laser intensity, laser frequency, pulse duration, and laser phase are selected to achieve a desired fidelity of the quantum gate.

21 . The method of claim 19 , wherein the quantum gate is a controlled-phase gate C N-1 Z(θ), wherein θ is a conditional-phase angle.

22 . The method of claim 21 , wherein N is 3 and the time-dependent values of the laser intensity, the laser frequency, laser phase, and pulse duration are selected based on the conditional-phase angle θ.

23 . The method of claim 21 , wherein N is 3 and the conditional-phase angle θ=π.

24 . The method of claim 19 , wherein N is 3 and the quantum gate is a controlled-controlled phase (C 2 Z(θ)) gate having a conditional-phase angle θ.

25 . A device comprising:

a grouping of N qubits, where N is equal to two or more; and

a coherent light source configured to, given selected values for a set of parameters of at least a first and a second laser pulse, wherein the set of parameters includes a relative phase shift between the first and second laser pulses, a laser frequency, a laser intensity, and a pulse duration:

sequentially apply at least the first and second laser pulses to all qubits within the grouping of N qubits, thereby coupling a non-interacting quantum state |1 to an interacting excited state |r , such that each qubit that begins in quantum state |1 returns to the state |1 upon completion of the at least first and second laser pulses, and wherein all qubits in the grouping are mutually blockaded.

26 . A device comprising:

a grouping of N qubits, where N is equal to three or more; and

a coherent light source configured to, given selected time-dependent values for a set of parameters of a laser pulse, wherein the set of parameters includes a laser phase, a laser frequency, a laser intensity, and a pulse duration:

apply the laser pulse to all qubits within a grouping of N qubits, thereby coupling a non-interacting quantum state |1 to an interacting excited state |r , such that each qubit that begins in quantum state |1 returns to the quantum state |1 upon completion of the laser pulse, and wherein all qubits in the grouping are mutually blockaded.

Continuity (3)
Continuation PCTUS2020041709 · Jul 10, 2020
Provisional Application 62873009 · Jul 11, 2019
Related Publication 20240289665A1 · Aug 29, 2024
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