Related Experiment Video
Updated: Mar 20, 2026
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
17.6K
High-Fidelity Resonator-Induced Phase Gate with Single-Mode Squeezing.
Shruti Puri1, Alexandre Blais1,2
1Départment de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1.
Physical Review Letters
|May 21, 2016
Summary
We improved two-qubit gates in circuit Quantum Electrodynamics (QED) using squeezed light. This method minimizes qubit dephasing, achieving high fidelity for controlled-phase gates.
Area of Science:
- Quantum computing
- Quantum information science
- Circuit Quantum Electrodynamics (Circuit QED)
Background:
- Two-qubit gates are essential for quantum computation.
- Qubit dephasing limits gate fidelity in circuit QED.
Purpose of the Study:
- To enhance the fidelity of two-qubit resonator-induced phase gates.
- To minimize qubit dephasing during gate operations.
Main Methods:
- Utilizing narrow-band single-mode squeezing.
- Analytical calculations and numerical simulations of a cascaded master equation.
- Investigating optimal squeezing angle and strength.
Main Results:
- Squeezing erases qubit "which-path" information, reducing dephasing.
- Achieved excellent agreement between analytical and numerical results.
- Demonstrated possibility of controlled-phase gates with 200 ns gate time and 10^-5 infidelity.
Conclusions:
- Narrow-band squeezing is an effective technique to improve gate fidelity in circuit QED.
- The proposed method offers a viable path towards fault-tolerant quantum computation.
- Realistic parameters allow for high-fidelity quantum gate operations.
Related Concept Videos
01:24Characteristics of Series Resonant Circuit
770
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
770
01:23Parallel Resonance
720
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
720
01:20Design Example: Capacitance Multiplier Circuit
1.7K
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
1.7K
01:26Resonance in an AC Circuit
2.7K
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
2.7K
01:17Series Resonance
996
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
996
01:12Double Resonance Techniques: Overview
835
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
835